31897384 has 8 divisors (see below), whose sum is σ = 59807610. Its totient is φ = 15948688.

The previous prime is 31897373. The next prime is 31897399. The reversal of 31897384 is 48379813.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27857284 + 4040100 = 5278^2 + 2010^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 31897384.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993579 + ... + 1993594.

Almost surely, 2^31897384 is an apocalyptic number.

It is an amenable number.

31897384 is a deficient number, since it is larger than the sum of its proper divisors (27910226).

31897384 is a wasteful number, since it uses less digits than its factorization.

31897384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987179 (or 3987175 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 31897384 is about 5647.7769077753. The cubic root of 31897384 is about 317.1404871103.

The spelling of 31897384 in words is "thirty-one million, eight hundred ninety-seven thousand, three hundred eighty-four".