39966975 has 36 divisors (see below), whose sum is σ = 75361000. Its totient is φ = 20191680.

The previous prime is 39966947. The next prime is 39966977. The reversal of 39966975 is 57966993.

It is not a de Polignac number, because 39966975 - 2⁵ = 39966943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39966977) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 400 + ... + 8949.

Almost surely, 2^39966975 is an apocalyptic number.

39966975 is a deficient number, since it is larger than the sum of its proper divisors (35394025).

39966975 is a wasteful number, since it uses less digits than its factorization.

39966975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384 (or 9376 counting only the distinct ones).

The product of its digits is 2755620, while the sum is 54.

The square root of 39966975 is about 6321.9439257241. The cubic root of 39966975 is about 341.9010434948.

The spelling of 39966975 in words is "thirty-nine million, nine hundred sixty-six thousand, nine hundred seventy-five".