6404538 has 32 divisors (see below), whose sum is σ = 15114240. Its totient is φ = 1770480.

The previous prime is 6404527. The next prime is 6404551. The reversal of 6404538 is 8354046.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1158 + ... + 3761.

It is an arithmetic number, because the mean of its divisors is an integer number (472320).

Almost surely, 2^6404538 is an apocalyptic number.

6404538 is an abundant number, since it is smaller than the sum of its proper divisors (8709702).

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

6404538 is a wasteful number, since it uses less digits than its factorization.

6404538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 6404538 is about 2530.7188702027. The cubic root of 6404538 is about 185.7074253312.

The spelling of 6404538 in words is "six million, four hundred four thousand, five hundred thirty-eight".