39679857 has 18 divisors (see below), whose sum is σ = 66673698. Its totient is φ = 22673952.

The previous prime is 39679831. The next prime is 39679897. The reversal of 39679857 is 75897693.

It can be written as a sum of positive squares in only one way, i.e., 39425841 + 254016 = 6279^2 + 504^2 .

It is not a de Polignac number, because 39679857 - 2⁶ = 39679793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39679817) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44548 + ... + 45429.

Almost surely, 2^39679857 is an apocalyptic number.

It is an amenable number.

39679857 is a deficient number, since it is larger than the sum of its proper divisors (26993841).

39679857 is a wasteful number, since it uses less digits than its factorization.

39679857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89997 (or 89987 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 39679857 is about 6299.1949485629. The cubic root of 39679857 is about 341.0803495983.

It can be divided in two parts, 3967 and 9857, that added together give a cube (13824 = 24³).

The spelling of 39679857 in words is "thirty-nine million, six hundred seventy-nine thousand, eight hundred fifty-seven".