231815980 has 48 divisors (see below), whose sum is σ = 539030016. Its totient is φ = 83033280.

The previous prime is 231815977. The next prime is 231816019. The reversal of 231815980 is 89518132.

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, 6877 + ... + 22603.

It is an arithmetic number, because the mean of its divisors is an integer number (11229792).

Almost surely, 2^231815980 is an apocalyptic number.

231815980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231815980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269515008).

231815980 is an abundant number, since it is smaller than the sum of its proper divisors (307214036).

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

231815980 is a wasteful number, since it uses less digits than its factorization.

231815980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15814 (or 15812 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 231815980 is about 15225.5042609432. The cubic root of 231815980 is about 614.3008601689.

It can be divided in two parts, 23181 and 5980, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 231815980 in words is "two hundred thirty-one million, eight hundred fifteen thousand, nine hundred eighty".