231857532 has 96 divisors (see below), whose sum is σ = 639475200. Its totient is φ = 72441216.

The previous prime is 231857489. The next prime is 231857539. The reversal of 231857532 is 235758132.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231857539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210808 + ... + 211904.

It is an arithmetic number, because the mean of its divisors is an integer number (6661200).

Almost surely, 2^231857532 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 231857532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319737600).

231857532 is an abundant number, since it is smaller than the sum of its proper divisors (407617668).

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

231857532 is a wasteful number, since it uses less digits than its factorization.

231857532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 1224 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 231857532 is about 15226.8687523075. The cubic root of 231857532 is about 614.3375615565.

The spelling of 231857532 in words is "two hundred thirty-one million, eight hundred fifty-seven thousand, five hundred thirty-two".