6404398 has 48 divisors (see below), whose sum is σ = 13157424. Its totient is φ = 2298240.

The previous prime is 6404381. The next prime is 6404401. The reversal of 6404398 is 8934046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13786 + ... + 14242.

It is an arithmetic number, because the mean of its divisors is an integer number (274113).

Almost surely, 2^6404398 is an apocalyptic number.

6404398 is an abundant number, since it is smaller than the sum of its proper divisors (6753026).

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

6404398 is a wasteful number, since it uses less digits than its factorization.

6404398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 6404398 is about 2530.6912099266. The cubic root of 6404398 is about 185.7060721642.

It can be divided in two parts, 6 and 404398, that added together give a palindrome (404404).

The spelling of 6404398 in words is "six million, four hundred four thousand, three hundred ninety-eight".