6404637 has 4 divisors (see below), whose sum is σ = 8539520. Its totient is φ = 4269756.

The previous prime is 6404623. The next prime is 6404639. The reversal of 6404637 is 7364046.

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 6404637 - 2⁸ = 6404381 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404639) 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, 1067437 + ... + 1067442.

It is an arithmetic number, because the mean of its divisors is an integer number (2134880).

Almost surely, 2^6404637 is an apocalyptic number.

It is an amenable number.

6404637 is a deficient number, since it is larger than the sum of its proper divisors (2134883).

6404637 is a wasteful number, since it uses less digits than its factorization.

6404637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134882.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 6404637 is about 2530.7384297868. The cubic root of 6404637 is about 185.7083822017.

The spelling of 6404637 in words is "six million, four hundred four thousand, six hundred thirty-seven".