399164358420 has 36 divisors (see below), whose sum is σ = 1210798554420. Its totient is φ = 106443828864.

The previous prime is 399164358391. The next prime is 399164358433. The reversal of 399164358420 is 24853461993.

399164358420 is a `hidden beast` number, since 3 + 9 + 9 + 16 + 43 + 584 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 225205295364 + 173959063056 = 474558^2 + 417084^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 1108789705 + ... + 1108790064.

Almost surely, 2^399164358420 is an apocalyptic number.

399164358420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399164358420 is an abundant number, since it is smaller than the sum of its proper divisors (811634196000).

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

399164358420 is a wasteful number, since it uses less digits than its factorization.

399164358420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217579784 (or 2217579779 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 399164358420 in words is "three hundred ninety-nine billion, one hundred sixty-four million, three hundred fifty-eight thousand, four hundred twenty".