39904979 has 2 divisors, whose sum is σ = 39904980. Its totient is φ = 39904978.

The previous prime is 39904961. The next prime is 39905003. The reversal of 39904979 is 97940993.

39904979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (97940993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39904979 - 2²⁰ = 38856403 is a prime.

It is not a weakly prime, because it can be changed into another prime (39904079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19952489 + 19952490.

It is an arithmetic number, because the mean of its divisors is an integer number (19952490).

Almost surely, 2^39904979 is an apocalyptic number.

39904979 is a deficient number, since it is larger than the sum of its proper divisors (1).

39904979 is an equidigital number, since it uses as much as digits as its factorization.

39904979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 39904979 is about 6317.0387841140. The cubic root of 39904979 is about 341.7241685757.

The spelling of 39904979 in words is "thirty-nine million, nine hundred four thousand, nine hundred seventy-nine".