390879864679 has 4 divisors (see below), whose sum is σ = 401444185384. Its totient is φ = 380315543976.

The previous prime is 390879864671. The next prime is 390879864703. The reversal of 390879864679 is 976468978093.

It is a happy number.

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 390879864679 - 2³ = 390879864671 is a prime.

It is a super-2 number, since 2×390879864679² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390879864671) 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, 5282160297 + ... + 5282160370.

It is an arithmetic number, because the mean of its divisors is an integer number (100361046346).

Almost surely, 2^390879864679 is an apocalyptic number.

390879864679 is a deficient number, since it is larger than the sum of its proper divisors (10564320705).

390879864679 is a wasteful number, since it uses less digits than its factorization.

390879864679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10564320704.

The product of its (nonzero) digits is 987614208, while the sum is 76.

The spelling of 390879864679 in words is "three hundred ninety billion, eight hundred seventy-nine million, eight hundred sixty-four thousand, six hundred seventy-nine".