231399936 has 160 divisors (see below), whose sum is σ = 721828800. Its totient is φ = 72990720.

The previous prime is 231399929. The next prime is 231399967. The reversal of 231399936 is 639993132.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 231399891 and 231399900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262216 + ... + 263096.

It is an arithmetic number, because the mean of its divisors is an integer number (4511430).

Almost surely, 2^231399936 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 231399936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360914400).

231399936 is an abundant number, since it is smaller than the sum of its proper divisors (490428864).

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

231399936 is an equidigital number, since it uses as much as digits as its factorization.

231399936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 905 counting only the distinct ones).

The product of its digits is 236196, while the sum is 45.

The square root of 231399936 is about 15211.8353922201. The cubic root of 231399936 is about 613.9331414360.

Adding to 231399936 its product of digits (236196), we get a palindrome (231636132).

The spelling of 231399936 in words is "two hundred thirty-one million, three hundred ninety-nine thousand, nine hundred thirty-six".