6409988 has 12 divisors (see below), whose sum is σ = 12080460. Its totient is φ = 2958432.

The previous prime is 6409943. The next prime is 6410009. The reversal of 6409988 is 8899046.

6409988 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2715904 + 3694084 = 1648^2 + 1922^2 .

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61583 + ... + 61686.

It is an arithmetic number, because the mean of its divisors is an integer number (1006705).

Almost surely, 2^6409988 is an apocalyptic number.

It is an amenable number.

6409988 is a deficient number, since it is larger than the sum of its proper divisors (5670472).

6409988 is a wasteful number, since it uses less digits than its factorization.

6409988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123286 (or 123284 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 6409988 is about 2531.7954103758. The cubic root of 6409988 is about 185.7600868720.

The spelling of 6409988 in words is "six million, four hundred nine thousand, nine hundred eighty-eight".