39647979 has 48 divisors (see below), whose sum is σ = 68432832. Its totient is φ = 21648384.

The previous prime is 39647947. The next prime is 39647981. The reversal of 39647979 is 97974693.

It is not a de Polignac number, because 39647979 - 2⁵ = 39647947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39647999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170047 + ... + 170279.

It is an arithmetic number, because the mean of its divisors is an integer number (1425684).

Almost surely, 2^39647979 is an apocalyptic number.

39647979 is a deficient number, since it is larger than the sum of its proper divisors (28784853).

39647979 is a wasteful number, since it uses less digits than its factorization.

39647979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 353 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 54.

The square root of 39647979 is about 6296.6641168161. The cubic root of 39647979 is about 340.9889860938.

The spelling of 39647979 in words is "thirty-nine million, six hundred forty-seven thousand, nine hundred seventy-nine".