39890665 has 8 divisors (see below), whose sum is σ = 47935368. Its totient is φ = 31868160.

The previous prime is 39890629. The next prime is 39890681. The reversal of 39890665 is 56609893.

39890665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 301401 + 39589264 = 549^2 + 6292^2 .

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

It is not a de Polignac number, because 39890665 - 2⁷ = 39890537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296 + ... + 9025.

It is an arithmetic number, because the mean of its divisors is an integer number (5991921).

Almost surely, 2^39890665 is an apocalyptic number.

It is an amenable number.

39890665 is a deficient number, since it is larger than the sum of its proper divisors (8044703).

39890665 is a wasteful number, since it uses less digits than its factorization.

39890665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11099.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 39890665 is about 6315.9057149391. The cubic root of 39890665 is about 341.6833046297.

The spelling of 39890665 in words is "thirty-nine million, eight hundred ninety thousand, six hundred sixty-five".