30904731 has 72 divisors (see below), whose sum is σ = 55189680. Its totient is φ = 16536960.

The previous prime is 30904729. The next prime is 30904733. The reversal of 30904731 is 13740903.

It is an interprime number because it is at equal distance from previous prime (30904729) and next prime (30904733).

It is not a de Polignac number, because 30904731 - 2¹ = 30904729 is a prime.

It is a super-2 number, since 2×30904731² = 1910204796364722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30904695 and 30904704.

It is not an unprimeable number, because it can be changed into a prime (30904733) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 523780 + ... + 523838.

Almost surely, 2^30904731 is an apocalyptic number.

30904731 is a deficient number, since it is larger than the sum of its proper divisors (24284949).

30904731 is a wasteful number, since it uses less digits than its factorization.

30904731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 30904731 is about 5559.2023708442. The cubic root of 30904731 is about 313.8159326630.

The spelling of 30904731 in words is "thirty million, nine hundred four thousand, seven hundred thirty-one".