256829 has 4 divisors (see below), whose sum is σ = 260160. Its totient is φ = 253500.

The previous prime is 256813. The next prime is 256831. The reversal of 256829 is 928652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256829 - 2⁴ = 256813 is a prime.

It is a super-2 number, since 2×256829² = 131922270482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256795 and 256804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1547 + ... + 1704.

It is an arithmetic number, because the mean of its divisors is an integer number (65040).

2²⁵⁶⁸²⁹ is an apocalyptic number.

It is an amenable number.

256829 is a deficient number, since it is larger than the sum of its proper divisors (3331).

256829 is an equidigital number, since it uses as much as digits as its factorization.

256829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330.

The product of its digits is 8640, while the sum is 32.

The square root of 256829 is about 506.7829910327. The cubic root of 256829 is about 63.5645075758.

The spelling of 256829 in words is "two hundred fifty-six thousand, eight hundred twenty-nine".