39639986 has 8 divisors (see below), whose sum is σ = 59486700. Its totient is φ = 19811088.

The previous prime is 39639973. The next prime is 39639997. The reversal of 39639986 is 68993693.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30525625 + 9114361 = 5525^2 + 3019^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6440 + ... + 10988.

Almost surely, 2^39639986 is an apocalyptic number.

39639986 is a deficient number, since it is larger than the sum of its proper divisors (19846714).

39639986 is a wasteful number, since it uses less digits than its factorization.

39639986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8908.

The product of its digits is 1889568, while the sum is 53.

The square root of 39639986 is about 6296.0293836671. The cubic root of 39639986 is about 340.9660701872.

The spelling of 39639986 in words is "thirty-nine million, six hundred thirty-nine thousand, nine hundred eighty-six".