6399544 has 16 divisors (see below), whose sum is σ = 12088800. Its totient is φ = 3175872.

The previous prime is 6399541. The next prime is 6399551. The reversal of 6399544 is 4459936.

It is a junction number, because it is equal to n+sod(n) for n = 6399497 and 6399506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824 + ... + 4015.

It is an arithmetic number, because the mean of its divisors is an integer number (755550).

Almost surely, 2^6399544 is an apocalyptic number.

It is an amenable number.

6399544 is a deficient number, since it is larger than the sum of its proper divisors (5689256).

6399544 is a wasteful number, since it uses less digits than its factorization.

6399544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5982 (or 5978 counting only the distinct ones).

The product of its digits is 116640, while the sum is 40.

The square root of 6399544 is about 2529.7320016160. The cubic root of 6399544 is about 185.6591437304.

The spelling of 6399544 in words is "six million, three hundred ninety-nine thousand, five hundred forty-four".