6399139862 has 32 divisors (see below), whose sum is σ = 10123977024. Its totient is φ = 3029529600.

The previous prime is 6399139861. The next prime is 6399139891. The reversal of 6399139862 is 2689319936.

It is a junction number, because it is equal to n+sod(n) for n = 6399139798 and 6399139807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399139861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1311287 + ... + 1316157.

It is an arithmetic number, because the mean of its divisors is an integer number (316374282).

Almost surely, 2^6399139862 is an apocalyptic number.

6399139862 is a deficient number, since it is larger than the sum of its proper divisors (3724837162).

6399139862 is a wasteful number, since it uses less digits than its factorization.

6399139862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5384.

The product of its digits is 3779136, while the sum is 56.

The square root of 6399139862 is about 79994.6239568635. The cubic root of 6399139862 is about 1856.5523545742.

The spelling of 6399139862 in words is "six billion, three hundred ninety-nine million, one hundred thirty-nine thousand, eight hundred sixty-two".