6399444 has 24 divisors (see below), whose sum is σ = 15297408. Its totient is φ = 2080960.

The previous prime is 6399433. The next prime is 6399457. The reversal of 6399444 is 4449936.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6012 + ... + 6995.

It is an arithmetic number, because the mean of its divisors is an integer number (637392).

Almost surely, 2^6399444 is an apocalyptic number.

It is an amenable number.

6399444 is an abundant number, since it is smaller than the sum of its proper divisors (8897964).

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

6399444 is a wasteful number, since it uses less digits than its factorization.

6399444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13055 (or 13053 counting only the distinct ones).

The product of its digits is 93312, while the sum is 39.

The square root of 6399444 is about 2529.7122365993. The cubic root of 6399444 is about 185.6581766817.

The spelling of 6399444 in words is "six million, three hundred ninety-nine thousand, four hundred forty-four".