30639919 has 2 divisors, whose sum is σ = 30639920. Its totient is φ = 30639918.

The previous prime is 30639877. The next prime is 30639937. The reversal of 30639919 is 91993603.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30639919 - 2¹⁷ = 30508847 is a prime.

It is a super-2 number, since 2×30639919² = 1877609272653122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30639619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15319959 + 15319960.

It is an arithmetic number, because the mean of its divisors is an integer number (15319960).

Almost surely, 2^30639919 is an apocalyptic number.

30639919 is a deficient number, since it is larger than the sum of its proper divisors (1).

30639919 is an equidigital number, since it uses as much as digits as its factorization.

30639919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 30639919 is about 5535.3336846120. Note that the first 3 decimals coincide. The cubic root of 30639919 is about 312.9170334051.

The spelling of 30639919 in words is "thirty million, six hundred thirty-nine thousand, nine hundred nineteen".