31390923 has 12 divisors (see below), whose sum is σ = 42362168. Its totient is φ = 20676480.

The previous prime is 31390921. The next prime is 31390927. The reversal of 31390923 is 32909313.

It is not a de Polignac number, because 31390923 - 2¹ = 31390921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31390921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23103 + ... + 24423.

Almost surely, 2^31390923 is an apocalyptic number.

31390923 is a deficient number, since it is larger than the sum of its proper divisors (10971245).

31390923 is an equidigital number, since it uses as much as digits as its factorization.

31390923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 31390923 is about 5602.7603018512. The cubic root of 31390923 is about 315.4530241500.

The spelling of 31390923 in words is "thirty-one million, three hundred ninety thousand, nine hundred twenty-three".