6400857 has 8 divisors (see below), whose sum is σ = 9036576. Its totient is φ = 4016192.

The previous prime is 6400843. The next prime is 6400873. The reversal of 6400857 is 7580046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6400857 - 2⁴ = 6400841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6400837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62703 + ... + 62804.

It is an arithmetic number, because the mean of its divisors is an integer number (1129572).

Almost surely, 2^6400857 is an apocalyptic number.

It is an amenable number.

6400857 is a deficient number, since it is larger than the sum of its proper divisors (2635719).

6400857 is a wasteful number, since it uses less digits than its factorization.

6400857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125527.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 6400857 is about 2529.9915019620. The cubic root of 6400857 is about 185.6718401447.

The spelling of 6400857 in words is "six million, four hundred thousand, eight hundred fifty-seven".