6403944 has 32 divisors (see below), whose sum is σ = 16117920. Its totient is φ = 2120256.

The previous prime is 6403939. The next prime is 6403967. The reversal of 6403944 is 4493046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3094 + ... + 4730.

It is an arithmetic number, because the mean of its divisors is an integer number (503685).

Almost surely, 2^6403944 is an apocalyptic number.

It is an amenable number.

6403944 is an abundant number, since it is smaller than the sum of its proper divisors (9713976).

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

6403944 is a wasteful number, since it uses less digits than its factorization.

6403944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809 (or 1805 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6403944 is about 2530.6015095230. The cubic root of 6403944 is about 185.7016839012.

The spelling of 6403944 in words is "six million, four hundred three thousand, nine hundred forty-four".