6399469440 has 768 divisors, whose sum is σ = 28202428800. Its totient is φ = 1300561920.

The previous prime is 6399469393. The next prime is 6399469441. The reversal of 6399469440 is 449649936.

It is a super-2 number, since 2×6399469440² = 81906418226987827200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399469441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15200430 + ... + 15200850.

Almost surely, 2^6399469440 is an apocalyptic number.

6399469440 is a gapful number since it is divisible by the number (60) 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 6399469440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14101214400).

6399469440 is an abundant number, since it is smaller than the sum of its proper divisors (21802959360).

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

6399469440 is a wasteful number, since it uses less digits than its factorization.

6399469440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 54.

The square root of 6399469440 is about 79996.6839312731. The cubic root of 6399469440 is about 1856.5842269987.

The spelling of 6399469440 in words is "six billion, three hundred ninety-nine million, four hundred sixty-nine thousand, four hundred forty".