6399888 has 160 divisors (see below), whose sum is σ = 20570112. Its totient is φ = 1689600.

The previous prime is 6399859. The next prime is 6399889. The reversal of 6399888 is 8889936.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 6399888.

It is not an unprimeable number, because it can be changed into a prime (6399889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206433 + ... + 206463.

Almost surely, 2^6399888 is an apocalyptic number.

6399888 is a gapful number since it is divisible by the number (68) 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 6399888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10285056).

6399888 is an abundant number, since it is smaller than the sum of its proper divisors (14170224).

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

6399888 is a wasteful number, since it uses less digits than its factorization.

6399888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 87 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 6399888 is about 2529.7999920942. The cubic root of 6399888 is about 185.6624703008.

The spelling of 6399888 in words is "six million, three hundred ninety-nine thousand, eight hundred eighty-eight".