6404006 has 24 divisors (see below), whose sum is σ = 11302416. Its totient is φ = 2713200.

The previous prime is 6404003. The next prime is 6404009. The reversal of 6404006 is 6004046.

It is an interprime number because it is at equal distance from previous prime (6404003) and next prime (6404009).

It is a super-2 number, since 2×6404006² = 82022585696072, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404003) 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, 9575 + ... + 10221.

It is an arithmetic number, because the mean of its divisors is an integer number (470934).

Almost surely, 2^6404006 is an apocalyptic number.

6404006 is a deficient number, since it is larger than the sum of its proper divisors (4898410).

6404006 is a wasteful number, since it uses less digits than its factorization.

6404006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6404006 is about 2530.6137595453. The cubic root of 6404006 is about 185.7022831916.

The spelling of 6404006 in words is "six million, four hundred four thousand, six".