39966785 has 32 divisors (see below), whose sum is σ = 53136000. Its totient is φ = 28740096.

The previous prime is 39966767. The next prime is 39966799. The reversal of 39966785 is 58766993.

It is a cyclic number.

It is not a de Polignac number, because 39966785 - 2⁶ = 39966721 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245114 + ... + 245276.

It is an arithmetic number, because the mean of its divisors is an integer number (1660500).

Almost surely, 2^39966785 is an apocalyptic number.

39966785 is the 5162-nd pentagonal number.

It is an amenable number.

39966785 is a deficient number, since it is larger than the sum of its proper divisors (13169215).

39966785 is a wasteful number, since it uses less digits than its factorization.

39966785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its digits is 2449440, while the sum is 53.

The square root of 39966785 is about 6321.9288986827. The cubic root of 39966785 is about 341.9005017033.

The spelling of 39966785 in words is "thirty-nine million, nine hundred sixty-six thousand, seven hundred eighty-five".