39979031 has 2 divisors, whose sum is σ = 39979032. Its totient is φ = 39979030.

The previous prime is 39979007. The next prime is 39979063. The reversal of 39979031 is 13097993.

It is a weak prime.

It is an emirp because it is prime and its reverse (13097993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39979031 is a prime.

It is a super-2 number, since 2×39979031² = 3196645839397922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39979031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39979001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989515 + 19989516.

It is an arithmetic number, because the mean of its divisors is an integer number (19989516).

Almost surely, 2^39979031 is an apocalyptic number.

39979031 is a deficient number, since it is larger than the sum of its proper divisors (1).

39979031 is an equidigital number, since it uses as much as digits as its factorization.

39979031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 39979031 is about 6322.8973580155. The cubic root of 39979031 is about 341.9354180802.

The spelling of 39979031 in words is "thirty-nine million, nine hundred seventy-nine thousand, thirty-one".