6404539 has 4 divisors (see below), whose sum is σ = 6741640. Its totient is φ = 6067440.

The previous prime is 6404527. The next prime is 6404551. The reversal of 6404539 is 9354046.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6404527) and next prime (6404551).

It is a cyclic number.

It is not a de Polignac number, because 6404539 - 2¹³ = 6396347 is a prime.

It is a Duffinian number.

6404539 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6404539.

It is not an unprimeable number, because it can be changed into a prime (6404599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168522 + ... + 168559.

It is an arithmetic number, because the mean of its divisors is an integer number (1685410).

Almost surely, 2^6404539 is an apocalyptic number.

6404539 is a deficient number, since it is larger than the sum of its proper divisors (337101).

6404539 is a wasteful number, since it uses less digits than its factorization.

6404539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337100.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 6404539 is about 2530.7190677750. The cubic root of 6404539 is about 185.7074349967.

The spelling of 6404539 in words is "six million, four hundred four thousand, five hundred thirty-nine".