870257 has 8 divisors (see below), whose sum is σ = 924960. Its totient is φ = 816480.

The previous prime is 870253. The next prime is 870271. The reversal of 870257 is 752078.

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 870257 - 2² = 870253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2957 + ... + 3237.

It is an arithmetic number, because the mean of its divisors is an integer number (115620).

2⁸⁷⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

870257 is a deficient number, since it is larger than the sum of its proper divisors (54703).

870257 is a wasteful number, since it uses less digits than its factorization.

870257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 870257 is about 932.8756615970. The cubic root of 870257 is about 95.4734262658.

The spelling of 870257 in words is "eight hundred seventy thousand, two hundred fifty-seven".