6399431379 has 16 divisors (see below), whose sum is σ = 10342515840. Its totient is φ = 3878443080.

The previous prime is 6399431369. The next prime is 6399431383. The reversal of 6399431379 is 9731349936.

It is not a de Polignac number, because 6399431379 - 2¹³ = 6399423187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6399431309) 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, 10773157 + ... + 10773750.

It is an arithmetic number, because the mean of its divisors is an integer number (646407240).

Almost surely, 2^6399431379 is an apocalyptic number.

6399431379 is a deficient number, since it is larger than the sum of its proper divisors (3943084461).

6399431379 is a wasteful number, since it uses less digits than its factorization.

6399431379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21546927 (or 21546921 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 54.

The square root of 6399431379 is about 79996.4460398085. The cubic root of 6399431379 is about 1856.5805462982.

The spelling of 6399431379 in words is "six billion, three hundred ninety-nine million, four hundred thirty-one thousand, three hundred seventy-nine".