156231972 has 144 divisors (see below), whose sum is σ = 458181360. Its totient is φ = 44457984.

The previous prime is 156231917. The next prime is 156231991. The reversal of 156231972 is 279132651.

156231972 is a `hidden beast` number, since 1 + 562 + 3 + 1 + 97 + 2 = 666.

156231972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 11655396 + 144576576 = 3414^2 + 12024^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 580654 + ... + 580922.

It is an arithmetic number, because the mean of its divisors is an integer number (3181815).

Almost surely, 2^156231972 is an apocalyptic number.

156231972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156231972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229090680).

156231972 is an abundant number, since it is smaller than the sum of its proper divisors (301949388).

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

156231972 is a wasteful number, since it uses less digits than its factorization.

156231972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 377 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 156231972 is about 12499.2788591982. The cubic root of 156231972 is about 538.5879569653.

The spelling of 156231972 in words is "one hundred fifty-six million, two hundred thirty-one thousand, nine hundred seventy-two".