864257 has 8 divisors (see below), whose sum is σ = 897600. Its totient is φ = 831600.

The previous prime is 864251. The next prime is 864277. The reversal of 864257 is 752468.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864257 is a prime.

It is a Duffinian number.

864257 is a modest number, since divided by 4257 gives 86 as remainder.

It is not an unprimeable number, because it can be changed into a prime (864251) 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, 4244 + ... + 4442.

It is an arithmetic number, because the mean of its divisors is an integer number (112200).

It is a Proth number, since it is equal to 211 ⋅ 2¹² + 1 and 211 < 2¹².

2⁸⁶⁴²⁵⁷ is an apocalyptic number.

It is an amenable number.

864257 is a deficient number, since it is larger than the sum of its proper divisors (33343).

864257 is a wasteful number, since it uses less digits than its factorization.

864257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its digits is 13440, while the sum is 32.

The square root of 864257 is about 929.6542367999. The cubic root of 864257 is about 95.2535057483.

The spelling of 864257 in words is "eight hundred sixty-four thousand, two hundred fifty-seven".