30047931 has 12 divisors (see below), whose sum is σ = 43535752. Its totient is φ = 19970496.

The previous prime is 30047923. The next prime is 30047939. The reversal of 30047931 is 13974003.

It is an interprime number because it is at equal distance from previous prime (30047923) and next prime (30047939).

It is not a de Polignac number, because 30047931 - 2³ = 30047923 is a prime.

It is a super-2 number, since 2×30047931² = 1805756314761522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30047895 and 30047904.

It is not an unprimeable number, because it can be changed into a prime (30047939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1921 + ... + 7986.

Almost surely, 2^30047931 is an apocalyptic number.

30047931 is a deficient number, since it is larger than the sum of its proper divisors (13487821).

30047931 is a wasteful number, since it uses less digits than its factorization.

30047931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10250 (or 10247 counting only the distinct ones).

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

The square root of 30047931 is about 5481.5993104203. The cubic root of 30047931 is about 310.8886433898. Note that the first 3 decimals are identical.

The spelling of 30047931 in words is "thirty million, forty-seven thousand, nine hundred thirty-one".