31987492 has 6 divisors (see below), whose sum is σ = 55978118. Its totient is φ = 15993744.

The previous prime is 31987477. The next prime is 31987511. The reversal of 31987492 is 29478913.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 8328996 = 4864^2 + 2886^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3998433 + ... + 3998440.

Almost surely, 2^31987492 is an apocalyptic number.

It is an amenable number.

31987492 is a deficient number, since it is larger than the sum of its proper divisors (23990626).

31987492 is a wasteful number, since it uses less digits than its factorization.

31987492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7996877 (or 7996875 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 31987492 is about 5655.7485799848. The cubic root of 31987492 is about 317.4388399772.

The spelling of 31987492 in words is "thirty-one million, nine hundred eighty-seven thousand, four hundred ninety-two".