6899904 has 140 divisors (see below), whose sum is σ = 22497288. Its totient is φ = 2090880.

The previous prime is 6899899. The next prime is 6899923. The reversal of 6899904 is 4099986.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=132.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 6899904.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 627259 + ... + 627269.

Almost surely, 2^6899904 is an apocalyptic number.

6899904 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 6899904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11248644).

6899904 is an abundant number, since it is smaller than the sum of its proper divisors (15597384).

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

6899904 is an equidigital number, since it uses as much as digits as its factorization.

6899904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 16 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 6899904 is about 2626.7668339615. The cubic root of 6899904 is about 190.3769432806.

The spelling of 6899904 in words is "six million, eight hundred ninety-nine thousand, nine hundred four".