• 156 can be written using four 4's:

156 has 12 divisors (see below), whose sum is σ = 392. Its totient is φ = 48.

The previous prime is 151. The next prime is 157. The reversal of 156 is 651.

156 is nontrivially palindromic in base 5.

156 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

156 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 13 = 156 / (1 + 5 + 6).

It is a O'Halloran number.

156 is strictly pandigital in base 4.

156 is a nontrivial repdigit in base 5.

It is a plaindrome in base 5, base 8, base 10 and base 16.

It is a nialpdrome in base 5, base 6, base 12, base 13, base 14 and base 15.

It is a zygodrome in base 5.

It is a congruent number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6 + ... + 18.

It is a pronic number, being equal to 12×13.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196).

156 is an abundant number, since it is smaller than the sum of its proper divisors (236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

156 is a wasteful number, since it uses less digits than its factorization.

156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20 (or 18 counting only the distinct ones).

The product of its digits is 30, while the sum is 12.

The square root of 156 is about 12.4899959968. The cubic root of 156 is about 5.3832126121.

Subtracting from 156 its sum of digits (12), we obtain a square (144 = 12^{2}).

It can be divided in two parts, 15 and 6, that added together give a triangular number (21 = T_{6}).

The spelling of 156 in words is "one hundred fifty-six", and thus it is an aban number.

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