6444999 has 12 divisors (see below), whose sum is σ = 10155912. Its totient is φ = 3906000.

The previous prime is 6444979. The next prime is 6445003. The reversal of 6444999 is 9994446.

It is not a de Polignac number, because 6444999 - 2⁵ = 6444967 is a prime.

It is a super-2 number, since 2×6444999² = 83076024220002, which contains 22 as substring.

6444999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32452 + ... + 32649.

It is an arithmetic number, because the mean of its divisors is an integer number (846326).

Almost surely, 2^6444999 is an apocalyptic number.

6444999 is a deficient number, since it is larger than the sum of its proper divisors (3710913).

6444999 is a wasteful number, since it uses less digits than its factorization.

6444999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65118 (or 65115 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 6444999 is about 2538.7002580061. The cubic root of 6444999 is about 186.0976767577.

The spelling of 6444999 in words is "six million, four hundred forty-four thousand, nine hundred ninety-nine".