6408990 has 64 divisors (see below), whose sum is σ = 19537920. Its totient is φ = 1464480.

The previous prime is 6408977. The next prime is 6408991. The reversal of 6408990 is 998046.

6408990 is a `hidden beast` number, since 640 + 8 + 9 + 9 + 0 = 666.

6408990 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6408991) 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, 195 + ... + 3585.

It is an arithmetic number, because the mean of its divisors is an integer number (305280).

Almost surely, 2^6408990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6408990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9768960).

6408990 is an abundant number, since it is smaller than the sum of its proper divisors (13128930).

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

6408990 is a wasteful number, since it uses less digits than its factorization.

6408990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414 (or 3408 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 6408990 is about 2531.5983093690. The cubic root of 6408990 is about 185.7504457625.

The spelling of 6408990 in words is "six million, four hundred eight thousand, nine hundred ninety".