390834004991 has 4 divisors (see below), whose sum is σ = 411404215800. Its totient is φ = 370263794184.

The previous prime is 390834004973. The next prime is 390834004993. The reversal of 390834004991 is 199400438093.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 390834004991 - 2⁶ = 390834004927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390834004993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10285105376 + ... + 10285105413.

It is an arithmetic number, because the mean of its divisors is an integer number (102851053950).

Almost surely, 2^390834004991 is an apocalyptic number.

390834004991 is a deficient number, since it is larger than the sum of its proper divisors (20570210809).

390834004991 is a wasteful number, since it uses less digits than its factorization.

390834004991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20570210808.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 390834004991 in words is "three hundred ninety billion, eight hundred thirty-four million, four thousand, nine hundred ninety-one".