6398657 has 4 divisors (see below), whose sum is σ = 6415920. Its totient is φ = 6381396.

The previous prime is 6398633. The next prime is 6398671. The reversal of 6398657 is 7568936.

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 a cyclic number.

It is not a de Polignac number, because 6398657 - 2⁶ = 6398593 is a prime.

It is a super-2 number, since 2×6398657² = 81885622807298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6398057) 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, 8063 + ... + 8820.

It is an arithmetic number, because the mean of its divisors is an integer number (1603980).

Almost surely, 2^6398657 is an apocalyptic number.

It is an amenable number.

6398657 is a deficient number, since it is larger than the sum of its proper divisors (17263).

6398657 is a wasteful number, since it uses less digits than its factorization.

6398657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17262.

The product of its digits is 272160, while the sum is 44.

The square root of 6398657 is about 2529.5566805272. The cubic root of 6398657 is about 185.6505656572.

The spelling of 6398657 in words is "six million, three hundred ninety-eight thousand, six hundred fifty-seven".