30939897 has 16 divisors (see below), whose sum is σ = 42840000. Its totient is φ = 19838784.

The previous prime is 30939869. The next prime is 30939907. The reversal of 30939897 is 79893903.

It is not a de Polignac number, because 30939897 - 2¹⁸ = 30677753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30939817) 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, 29854 + ... + 30872.

It is an arithmetic number, because the mean of its divisors is an integer number (2677500).

Almost surely, 2^30939897 is an apocalyptic number.

It is an amenable number.

30939897 is a deficient number, since it is larger than the sum of its proper divisors (11900103).

30939897 is a wasteful number, since it uses less digits than its factorization.

30939897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 30939897 is about 5562.3643354243. The cubic root of 30939897 is about 313.9349162578.

The spelling of 30939897 in words is "thirty million, nine hundred thirty-nine thousand, eight hundred ninety-seven".