231451440 has 80 divisors (see below), whose sum is σ = 782735616. Its totient is φ = 56108800.

The previous prime is 231451421. The next prime is 231451501. The reversal of 231451440 is 44154132.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 231451440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41196 + ... + 46475.

Almost surely, 2^231451440 is an apocalyptic number.

231451440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231451440 is an abundant number, since it is smaller than the sum of its proper divisors (551284176).

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

231451440 is a wasteful number, since it uses less digits than its factorization.

231451440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87698 (or 87692 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 231451440 is about 15213.5281903969. The cubic root of 231451440 is about 613.9786869209.

The spelling of 231451440 in words is "two hundred thirty-one million, four hundred fifty-one thousand, four hundred forty".