39979613 has 2 divisors, whose sum is σ = 39979614. Its totient is φ = 39979612.

The previous prime is 39979571. The next prime is 39979627. The reversal of 39979613 is 31697993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22448644 + 17530969 = 4738^2 + 4187^2 .

It is a cyclic number.

It is not a de Polignac number, because 39979613 - 2¹⁴ = 39963229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39979673) 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, 19989806 + 19989807.

It is an arithmetic number, because the mean of its divisors is an integer number (19989807).

Almost surely, 2^39979613 is an apocalyptic number.

It is an amenable number.

39979613 is a deficient number, since it is larger than the sum of its proper divisors (1).

39979613 is an equidigital number, since it uses as much as digits as its factorization.

39979613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 47.

The square root of 39979613 is about 6322.9433810528. The cubic root of 39979613 is about 341.9370773288.

The spelling of 39979613 in words is "thirty-nine million, nine hundred seventy-nine thousand, six hundred thirteen".