231347640 has 32 divisors (see below), whose sum is σ = 694043280. Its totient is φ = 61692672.

The previous prime is 231347621. The next prime is 231347651. The reversal of 231347640 is 46743132.

231347640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 231347598 and 231347607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 963829 + ... + 964068.

Almost surely, 2^231347640 is an apocalyptic number.

231347640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231347640 is an abundant number, since it is smaller than the sum of its proper divisors (462695640).

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

231347640 is a wasteful number, since it uses less digits than its factorization.

231347640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927911 (or 1927907 counting only the distinct ones).

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

The square root of 231347640 is about 15210.1163703635. The cubic root of 231347640 is about 613.8868886625.

The spelling of 231347640 in words is "two hundred thirty-one million, three hundred forty-seven thousand, six hundred forty".