6404493 has 4 divisors (see below), whose sum is σ = 8539328. Its totient is φ = 4269660.

The previous prime is 6404477. The next prime is 6404521. The reversal of 6404493 is 3944046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6404493 - 2⁴ = 6404477 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6404493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404473) 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, 1067413 + ... + 1067418.

It is an arithmetic number, because the mean of its divisors is an integer number (2134832).

Almost surely, 2^6404493 is an apocalyptic number.

It is an amenable number.

6404493 is a deficient number, since it is larger than the sum of its proper divisors (2134835).

6404493 is a wasteful number, since it uses less digits than its factorization.

6404493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134834.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6404493 is about 2530.7099794326. The cubic root of 6404493 is about 185.7069903869.

The spelling of 6404493 in words is "six million, four hundred four thousand, four hundred ninety-three".