39939139 has 2 divisors, whose sum is σ = 39939140. Its totient is φ = 39939138.

The previous prime is 39939089. The next prime is 39939173. The reversal of 39939139 is 93193993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39939139 - 2¹¹ = 39937091 is a prime.

It is a super-2 number, since 2×39939139² = 3190269648122642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39931139) 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, 19969569 + 19969570.

It is an arithmetic number, because the mean of its divisors is an integer number (19969570).

Almost surely, 2^39939139 is an apocalyptic number.

39939139 is a deficient number, since it is larger than the sum of its proper divisors (1).

39939139 is an equidigital number, since it uses as much as digits as its factorization.

39939139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 177147, while the sum is 46.

The square root of 39939139 is about 6319.7420042277. The cubic root of 39939139 is about 341.8216498805.

The spelling of 39939139 in words is "thirty-nine million, nine hundred thirty-nine thousand, one hundred thirty-nine".