390911990 has 16 divisors (see below), whose sum is σ = 804161952. Its totient is φ = 134026944.

The previous prime is 390911951. The next prime is 390912001. The reversal of 390911990 is 99119093.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2792159 + ... + 2792298.

It is an arithmetic number, because the mean of its divisors is an integer number (50260122).

Almost surely, 2^390911990 is an apocalyptic number.

390911990 is an abundant number, since it is smaller than the sum of its proper divisors (413249962).

390911990 is a wasteful number, since it uses less digits than its factorization.

390911990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584471.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 390911990 is about 19771.4943795354. The cubic root of 390911990 is about 731.1834123505.

The spelling of 390911990 in words is "three hundred ninety million, nine hundred eleven thousand, nine hundred ninety".