39664685 has 8 divisors (see below), whose sum is σ = 50102880. Its totient is φ = 30061584.

The previous prime is 39664661. The next prime is 39664687. The reversal of 39664685 is 58646693.

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

It is a cyclic number.

It is not a de Polignac number, because 39664685 - 2¹⁸ = 39402541 is a prime.

It is a super-2 number, since 2×39664685² = 3146574472298450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39664687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208667 + ... + 208856.

It is an arithmetic number, because the mean of its divisors is an integer number (6262860).

Almost surely, 2^39664685 is an apocalyptic number.

It is an amenable number.

39664685 is a deficient number, since it is larger than the sum of its proper divisors (10438195).

39664685 is a wasteful number, since it uses less digits than its factorization.

39664685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417547.

The product of its digits is 933120, while the sum is 47.

The square root of 39664685 is about 6297.9905525493. The cubic root of 39664685 is about 341.0368722007.

The spelling of 39664685 in words is "thirty-nine million, six hundred sixty-four thousand, six hundred eighty-five".