256446 has 20 divisors (see below), whose sum is σ = 574992. Its totient is φ = 85428.

The previous prime is 256441. The next prime is 256469. The reversal of 256446 is 644652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256441) by changing a digit.

256446 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 9 ways as a sum of consecutive naturals, for example, 630 + ... + 953.

2²⁵⁶⁴⁴⁶ is an apocalyptic number.

256446 is an abundant number, since it is smaller than the sum of its proper divisors (318546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256446 is a wasteful number, since it uses less digits than its factorization.

256446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597 (or 1588 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 256446 is about 506.4049762789. The cubic root of 256446 is about 63.5328946892.

The spelling of 256446 in words is "two hundred fifty-six thousand, four hundred forty-six".