30939705 has 32 divisors (see below), whose sum is σ = 56785920. Its totient is φ = 15966720.

The previous prime is 30939691. The next prime is 30939709. The reversal of 30939705 is 50793903.

It is not a de Polignac number, because 30939705 - 2¹² = 30935609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30939705.

It is not an unprimeable number, because it can be changed into a prime (30939709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 489 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (1774560).

Almost surely, 2^30939705 is an apocalyptic number.

It is an amenable number.

30939705 is a deficient number, since it is larger than the sum of its proper divisors (25846215).

30939705 is a wasteful number, since it uses less digits than its factorization.

30939705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7438 (or 7432 counting only the distinct ones).

The product of its (nonzero) digits is 25515, while the sum is 36.

The square root of 30939705 is about 5562.3470765496. The cubic root of 30939705 is about 313.9342668737.

The spelling of 30939705 in words is "thirty million, nine hundred thirty-nine thousand, seven hundred five".