39979779 has 16 divisors (see below), whose sum is σ = 61608960. Its totient is φ = 22587840.

The previous prime is 39979769. The next prime is 39979813. The reversal of 39979779 is 97797993.

It is not a de Polignac number, because 39979779 - 2⁴ = 39979763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39979729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8827 + ... + 12564.

It is an arithmetic number, because the mean of its divisors is an integer number (3850560).

Almost surely, 2^39979779 is an apocalyptic number.

39979779 is a deficient number, since it is larger than the sum of its proper divisors (21629181).

39979779 is a wasteful number, since it uses less digits than its factorization.

39979779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21490.

The product of its digits is 6751269, while the sum is 60.

The square root of 39979779 is about 6322.9565078371. The cubic root of 39979779 is about 341.9375505823.

The spelling of 39979779 in words is "thirty-nine million, nine hundred seventy-nine thousand, seven hundred seventy-nine".