399240679278 has 32 divisors (see below), whose sum is σ = 923544711936. Its totient is φ = 112694442048.

The previous prime is 399240679261. The next prime is 399240679283. The reversal of 399240679278 is 872976042993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57259951 + ... + 57266922.

It is an arithmetic number, because the mean of its divisors is an integer number (28860772248).

Almost surely, 2^399240679278 is an apocalyptic number.

399240679278 is an abundant number, since it is smaller than the sum of its proper divisors (524304032658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399240679278 is a wasteful number, since it uses less digits than its factorization.

399240679278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114526968.

The product of its (nonzero) digits is 82301184, while the sum is 66.

The spelling of 399240679278 in words is "three hundred ninety-nine billion, two hundred forty million, six hundred seventy-nine thousand, two hundred seventy-eight".