30939391 has 16 divisors (see below), whose sum is σ = 37382400. Its totient is φ = 25014528.

The previous prime is 30939373. The next prime is 30939407. The reversal of 30939391 is 19393903.

It is not a de Polignac number, because 30939391 - 2¹¹ = 30937343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30939391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30939341) 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, 46620 + ... + 47278.

It is an arithmetic number, because the mean of its divisors is an integer number (2336400).

Almost surely, 2^30939391 is an apocalyptic number.

30939391 is a deficient number, since it is larger than the sum of its proper divisors (6443009).

30939391 is a wasteful number, since it uses less digits than its factorization.

30939391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038.

The product of its (nonzero) digits is 19683, while the sum is 37.

The square root of 30939391 is about 5562.3188509829. The cubic root of 30939391 is about 313.9332048544.

The spelling of 30939391 in words is "thirty million, nine hundred thirty-nine thousand, three hundred ninety-one".