30639139 has 2 divisors, whose sum is σ = 30639140. Its totient is φ = 30639138.

The previous prime is 30639121. The next prime is 30639143. The reversal of 30639139 is 93193603.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30639139 - 2⁵ = 30639107 is a prime.

It is a super-2 number, since 2×30639139² = 1877513677322642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30639149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15319569 + 15319570.

It is an arithmetic number, because the mean of its divisors is an integer number (15319570).

Almost surely, 2^30639139 is an apocalyptic number.

30639139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30639139 is an equidigital number, since it uses as much as digits as its factorization.

30639139 is an odious number, because the sum of its binary digits is odd.

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

The square root of 30639139 is about 5535.2632277065. The cubic root of 30639139 is about 312.9143780744.

It can be divided in two parts, 30639 and 139, that multiplied together give a triangular number (4258821 = T₂₉₁₈).

The spelling of 30639139 in words is "thirty million, six hundred thirty-nine thousand, one hundred thirty-nine".