321406872 has 32 divisors (see below), whose sum is σ = 823117680. Its totient is φ = 104522240.

The previous prime is 321406871. The next prime is 321406873. The reversal of 321406872 is 278604123.

It is an interprime number because it is at equal distance from previous prime (321406871) and next prime (321406873).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321406871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162333 + ... + 164300.

Almost surely, 2^321406872 is an apocalyptic number.

It is an amenable number.

321406872 is an abundant number, since it is smaller than the sum of its proper divisors (501710808).

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

321406872 is a wasteful number, since it uses less digits than its factorization.

321406872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326683 (or 326679 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 321406872 is about 17927.8239616525. The cubic root of 321406872 is about 684.9912954654.

The spelling of 321406872 in words is "three hundred twenty-one million, four hundred six thousand, eight hundred seventy-two".