31974945 has 16 divisors (see below), whose sum is σ = 53384832. Its totient is φ = 16311680.

The previous prime is 31974913. The next prime is 31974947. The reversal of 31974945 is 54947913.

It is not a de Polignac number, because 31974945 - 2⁵ = 31974913 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31974897 and 31974906.

It is not an unprimeable number, because it can be changed into a prime (31974947) 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, 45996 + ... + 46685.

It is an arithmetic number, because the mean of its divisors is an integer number (3336552).

Almost surely, 2^31974945 is an apocalyptic number.

It is an amenable number.

31974945 is a deficient number, since it is larger than the sum of its proper divisors (21409887).

31974945 is a wasteful number, since it uses less digits than its factorization.

31974945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92712.

The product of its digits is 136080, while the sum is 42.

The square root of 31974945 is about 5654.6392457875. The cubic root of 31974945 is about 317.3973297311.

The spelling of 31974945 in words is "thirty-one million, nine hundred seventy-four thousand, nine hundred forty-five".