39391990 has 16 divisors (see below), whose sum is σ = 77351760. Its totient is φ = 14324320.

The previous prime is 39391987. The next prime is 39392011. The reversal of 39391990 is 9919393.

39391990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 7.

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 7 ways as a sum of consecutive naturals, for example, 178945 + ... + 179164.

It is an arithmetic number, because the mean of its divisors is an integer number (4834485).

Almost surely, 2^39391990 is an apocalyptic number.

39391990 is a deficient number, since it is larger than the sum of its proper divisors (37959770).

39391990 is a wasteful number, since it uses less digits than its factorization.

39391990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358127.

The product of its (nonzero) digits is 59049, while the sum is 43.

The square root of 39391990 is about 6276.3038486039. The cubic root of 39391990 is about 340.2535306239.

It can be divided in two parts, 3939 and 1990, that added together give a square (5929 = 77²).

The spelling of 39391990 in words is "thirty-nine million, three hundred ninety-one thousand, nine hundred ninety".