321400872 has 80 divisors (see below), whose sum is σ = 969493140. Its totient is φ = 98889984.

The previous prime is 321400843. The next prime is 321400913. The reversal of 321400872 is 278004123.

It can be written as a sum of positive squares in 2 ways, for example, as 319479876 + 1920996 = 17874^2 + 1386^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10653 + ... + 27500.

Almost surely, 2^321400872 is an apocalyptic number.

It is an amenable number.

321400872 is an abundant number, since it is smaller than the sum of its proper divisors (648092268).

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

321400872 is a wasteful number, since it uses less digits than its factorization.

321400872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38184 (or 38171 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 321400872 is about 17927.6566232177. The cubic root of 321400872 is about 684.9870329831.

Adding to 321400872 its reverse (278004123), we get a palindrome (599404995).

The spelling of 321400872 in words is "three hundred twenty-one million, four hundred thousand, eight hundred seventy-two".