30639937 has 2 divisors, whose sum is σ = 30639938. Its totient is φ = 30639936.

The previous prime is 30639919. The next prime is 30639953. The reversal of 30639937 is 73993603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17564481 + 13075456 = 4191^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 30639937 - 2⁷ = 30639809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30639937.

It is not a weakly prime, because it can be changed into another prime (30639437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15319968 + 15319969.

It is an arithmetic number, because the mean of its divisors is an integer number (15319969).

Almost surely, 2^30639937 is an apocalyptic number.

It is an amenable number.

30639937 is a deficient number, since it is larger than the sum of its proper divisors (1).

30639937 is an equidigital number, since it uses as much as digits as its factorization.

30639937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 40.

The square root of 30639937 is about 5535.3353105300. The cubic root of 30639937 is about 312.9170946815.

The spelling of 30639937 in words is "thirty million, six hundred thirty-nine thousand, nine hundred thirty-seven".