39970665 has 80 divisors (see below), whose sum is σ = 85586688. Its totient is φ = 17449344.

The previous prime is 39970643. The next prime is 39970673. The reversal of 39970665 is 56607993.

It is not a de Polignac number, because 39970665 - 2⁷ = 39970537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 39970665.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 64899 + ... + 65511.

Almost surely, 2^39970665 is an apocalyptic number.

39970665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39970665 is an abundant number, since it is smaller than the sum of its proper divisors (45616023).

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

39970665 is a wasteful number, since it uses less digits than its factorization.

39970665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 39970665 is about 6322.2357596028. The cubic root of 39970665 is about 341.9115653154.

The spelling of 39970665 in words is "thirty-nine million, nine hundred seventy thousand, six hundred sixty-five".