39685986 has 24 divisors (see below), whose sum is σ = 86207004. Its totient is φ = 13194720.

The previous prime is 39685981. The next prime is 39685993. The reversal of 39685986 is 68958693.

It can be written as a sum of positive squares in 2 ways, for example, as 38675961 + 1010025 = 6219^2 + 1005^2 .

It is not an unprimeable number, because it can be changed into a prime (39685981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4960 + ... + 10196.

Almost surely, 2^39685986 is an apocalyptic number.

39685986 is an abundant number, since it is smaller than the sum of its proper divisors (46521018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39685986 is a wasteful number, since it uses less digits than its factorization.

39685986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666 (or 5663 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 39685986 is about 6299.6814205164. The cubic root of 39685986 is about 341.0979099257.

The spelling of 39685986 in words is "thirty-nine million, six hundred eighty-five thousand, nine hundred eighty-six".