232865721 has 24 divisors (see below), whose sum is σ = 367814304. Its totient is φ = 140794560.

The previous prime is 232865663. The next prime is 232865771. The reversal of 232865721 is 127568232.

232865721 is a `hidden beast` number, since 2 + 3 + 2 + 86 + 572 + 1 = 666.

It is not a de Polignac number, because 232865721 - 2⁶ = 232865657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (232865771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42670 + ... + 47816.

It is an arithmetic number, because the mean of its divisors is an integer number (15325596).

Almost surely, 2^232865721 is an apocalyptic number.

It is an amenable number.

232865721 is a deficient number, since it is larger than the sum of its proper divisors (134948583).

232865721 is a wasteful number, since it uses less digits than its factorization.

232865721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5621 (or 5618 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 232865721 is about 15259.9384336897. The cubic root of 232865721 is about 615.2267179179.

It can be divided in two parts, 232865 and 721, that added together give a triangular number (233586 = T₆₈₃).

The spelling of 232865721 in words is "two hundred thirty-two million, eight hundred sixty-five thousand, seven hundred twenty-one".