256853 has 8 divisors (see below), whose sum is σ = 281880. Its totient is φ = 232960.

The previous prime is 256831. The next prime is 256873. The reversal of 256853 is 358652.

It can be written as a sum of positive squares in 4 ways, for example, as 47089 + 209764 = 217^2 + 458^2 .

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-256853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a d-powerful number, because it can be written as 2⁵ + 5³ + 8⁵ + 6⁶ + 5³ + 3¹¹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256813) 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, 233 + ... + 753.

It is an arithmetic number, because the mean of its divisors is an integer number (35235).

2²⁵⁶⁸⁵³ is an apocalyptic number.

It is an amenable number.

256853 is a deficient number, since it is larger than the sum of its proper divisors (25027).

256853 is a wasteful number, since it uses less digits than its factorization.

256853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567.

The product of its digits is 7200, while the sum is 29.

The square root of 256853 is about 506.8066692537. The cubic root of 256853 is about 63.5664874933.

The spelling of 256853 in words is "two hundred fifty-six thousand, eight hundred fifty-three".