31974939 has 16 divisors (see below), whose sum is σ = 47472640. Its totient is φ = 21270600.

The previous prime is 31974913. The next prime is 31974947. The reversal of 31974939 is 93947913.

It is not a de Polignac number, because 31974939 - 2⁹ = 31974427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31974894 and 31974903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31974979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15414 + ... + 17364.

It is an arithmetic number, because the mean of its divisors is an integer number (2967040).

Almost surely, 2^31974939 is an apocalyptic number.

31974939 is a deficient number, since it is larger than the sum of its proper divisors (15497701).

31974939 is a wasteful number, since it uses less digits than its factorization.

31974939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2567 (or 2561 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 31974939 is about 5654.6387152496. The cubic root of 31974939 is about 317.3973098782.

The spelling of 31974939 in words is "thirty-one million, nine hundred seventy-four thousand, nine hundred thirty-nine".