231397632 has 108 divisors (see below), whose sum is σ = 677586000. Its totient is φ = 75930624.

The previous prime is 231397631. The next prime is 231397643. The reversal of 231397632 is 236793132.

231397632 is a `hidden beast` number, since 2 + 3 + 13 + 9 + 7 + 632 = 666.

231397632 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (231397631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153619 + ... + 155117.

Almost surely, 2^231397632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231397632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338793000).

231397632 is an abundant number, since it is smaller than the sum of its proper divisors (446188368).

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

231397632 is a wasteful number, since it uses less digits than its factorization.

231397632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1571 counting only the distinct ones).

The product of its digits is 40824, while the sum is 36.

The square root of 231397632 is about 15211.7596615250. The cubic root of 231397632 is about 613.9311038286.

The spelling of 231397632 in words is "two hundred thirty-one million, three hundred ninety-seven thousand, six hundred thirty-two".