231365840 has 20 divisors (see below), whose sum is σ = 537925764. Its totient is φ = 92546304.

The previous prime is 231365839. The next prime is 231365867. The reversal of 231365840 is 48563132.

231365840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 23775376 + 207590464 = 4876^2 + 14408^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 231365797 and 231365806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445957 + ... + 1446116.

Almost surely, 2^231365840 is an apocalyptic number.

231365840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231365840 is an abundant number, since it is smaller than the sum of its proper divisors (306559924).

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

231365840 is a wasteful number, since it uses less digits than its factorization.

231365840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892086 (or 2892080 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 231365840 is about 15210.7146446181. The cubic root of 231365840 is about 613.9029862957.

The spelling of 231365840 in words is "two hundred thirty-one million, three hundred sixty-five thousand, eight hundred forty".