231437640 has 64 divisors (see below), whose sum is σ = 793503360. Its totient is φ = 52899840.

The previous prime is 231437621. The next prime is 231437659. The reversal of 231437640 is 46734132.

It is an interprime number because it is at equal distance from previous prime (231437621) and next prime (231437659).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 231437598 and 231437607.

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, 136921 + ... + 138600.

It is an arithmetic number, because the mean of its divisors is an integer number (12398490).

Almost surely, 2^231437640 is an apocalyptic number.

231437640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231437640 is an abundant number, since it is smaller than the sum of its proper divisors (562065720).

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

231437640 is a wasteful number, since it uses less digits than its factorization.

231437640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275542 (or 275538 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 231437640 is about 15213.0746399273. The cubic root of 231437640 is about 613.9664841103.

The spelling of 231437640 in words is "two hundred thirty-one million, four hundred thirty-seven thousand, six hundred forty".