256899 has 8 divisors (see below), whose sum is σ = 360640. Its totient is φ = 162216.

The previous prime is 256889. The next prime is 256901. The reversal of 256899 is 998652.

It is a happy number.

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

It is not a de Polignac number, because 256899 - 2⁷ = 256771 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2197 + ... + 2310.

It is an arithmetic number, because the mean of its divisors is an integer number (45080).

2²⁵⁶⁸⁹⁹ is an apocalyptic number.

256899 is a deficient number, since it is larger than the sum of its proper divisors (103741).

256899 is a wasteful number, since it uses less digits than its factorization.

256899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4529.

The product of its digits is 38880, while the sum is 39.

The square root of 256899 is about 506.8520494188. The cubic root of 256899 is about 63.5702819904.

The spelling of 256899 in words is "two hundred fifty-six thousand, eight hundred ninety-nine".