39990215 has 16 divisors (see below), whose sum is σ = 51245568. Its totient is φ = 29885856.

The previous prime is 39990199. The next prime is 39990227. The reversal of 39990215 is 51209993.

39990215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 39990215 - 2⁴ = 39990199 is a prime.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 902 + ... + 8988.

It is an arithmetic number, because the mean of its divisors is an integer number (3202848).

Almost surely, 2^39990215 is an apocalyptic number.

39990215 is a deficient number, since it is larger than the sum of its proper divisors (11255353).

39990215 is a wasteful number, since it uses less digits than its factorization.

39990215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8158.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 39990215 is about 6323.7817008496. The cubic root of 39990215 is about 341.9673002034.

The spelling of 39990215 in words is "thirty-nine million, nine hundred ninety thousand, two hundred fifteen".