30639913 has 16 divisors (see below), whose sum is σ = 33120000. Its totient is φ = 28259712.

The previous prime is 30639877. The next prime is 30639919. The reversal of 30639913 is 31993603.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30639913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30639919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205563 + ... + 205711.

It is an arithmetic number, because the mean of its divisors is an integer number (2070000).

Almost surely, 2^30639913 is an apocalyptic number.

It is an amenable number.

30639913 is a deficient number, since it is larger than the sum of its proper divisors (2480087).

30639913 is a wasteful number, since it uses less digits than its factorization.

30639913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 13122, while the sum is 34.

The square root of 30639913 is about 5535.3331426392. Note that the first 3 decimals coincide. The cubic root of 30639913 is about 312.9170129797.

The spelling of 30639913 in words is "thirty million, six hundred thirty-nine thousand, nine hundred thirteen".