31400872 has 8 divisors (see below), whose sum is σ = 58876650. Its totient is φ = 15700432.

The previous prime is 31400869. The next prime is 31400893. The reversal of 31400872 is 27800413.

It can be written as a sum of positive squares in only one way, i.e., 24462916 + 6937956 = 4946^2 + 2634^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1962547 + ... + 1962562.

Almost surely, 2^31400872 is an apocalyptic number.

It is an amenable number.

31400872 is a deficient number, since it is larger than the sum of its proper divisors (27475778).

31400872 is a wasteful number, since it uses less digits than its factorization.

31400872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925115 (or 3925111 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 31400872 is about 5603.6480974451. The cubic root of 31400872 is about 315.4863470592.

The spelling of 31400872 in words is "thirty-one million, four hundred thousand, eight hundred seventy-two".