6399203904 has 168 divisors, whose sum is σ = 19291259360. Its totient is φ = 2080097280.

The previous prime is 6399203891. The next prime is 6399203917. The reversal of 6399203904 is 4093029936.

6399203904 is a `hidden beast` number, since 639 + 9 + 2 + 0 + 3 + 9 + 0 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (6399203891) and next prime (6399203917).

It is a self number, because there is not a number n which added to its sum of digits gives 6399203904.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2903667 + ... + 2905869.

Almost surely, 2^6399203904 is an apocalyptic number.

6399203904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6399203904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9645629680).

6399203904 is an abundant number, since it is smaller than the sum of its proper divisors (12892055456).

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

6399203904 is a wasteful number, since it uses less digits than its factorization.

6399203904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2249 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 45.

The square root of 6399203904 is about 79995.0242452617. The cubic root of 6399203904 is about 1856.5585479549.

The spelling of 6399203904 in words is "six billion, three hundred ninety-nine million, two hundred three thousand, nine hundred four".