231990400 has 48 divisors (see below), whose sum is σ = 573096690. Its totient is φ = 92794880.

The previous prime is 231990379. The next prime is 231990403. The reversal of 231990400 is 4099132.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 153561664 + 78428736 = 12392^2 + 8856^2 .

It is not an unprimeable number, because it can be changed into a prime (231990403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33049 + ... + 39448.

Almost surely, 2^231990400 is an apocalyptic number.

231990400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231990400 is an abundant number, since it is smaller than the sum of its proper divisors (341106290).

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

231990400 is an equidigital number, since it uses as much as digits as its factorization.

231990400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72521 (or 72504 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 231990400 is about 15231.2310730289. The cubic root of 231990400 is about 614.4548896635.

The spelling of 231990400 in words is "two hundred thirty-one million, nine hundred ninety thousand, four hundred".