856457 has 8 divisors (see below), whose sum is σ = 1012800. Its totient is φ = 708624.

The previous prime is 856441. The next prime is 856459. The reversal of 856457 is 754658.

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

It is not a de Polignac number, because 856457 - 2⁴ = 856441 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 8² + 5⁴ + 4⁷ + 6³ + 5⁶ + 7⁷ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856459) 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, 1907 + ... + 2312.

It is an arithmetic number, because the mean of its divisors is an integer number (126600).

2⁸⁵⁶⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

856457 is a deficient number, since it is larger than the sum of its proper divisors (156343).

856457 is a wasteful number, since it uses less digits than its factorization.

856457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255.

The product of its digits is 33600, while the sum is 35.

The square root of 856457 is about 925.4496204548. The cubic root of 856457 is about 94.9660820745.

It can be divided in two parts, 85 and 6457, that multiplied together give a palindrome (548845).

The spelling of 856457 in words is "eight hundred fifty-six thousand, four hundred fifty-seven".