256494 has 32 divisors (see below), whose sum is σ = 608256. Its totient is φ = 70560.

The previous prime is 256493. The next prime is 256499. The reversal of 256494 is 494652.

It is an Ulam number.

Its product of digits (8640) is a multiple of the sum of its prime divisors (240).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256493) 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 15 ways as a sum of consecutive naturals, for example, 1204 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (19008).

2²⁵⁶⁴⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304128).

256494 is an abundant number, since it is smaller than the sum of its proper divisors (351762).

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

256494 is a wasteful number, since it uses less digits than its factorization.

256494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240.

The product of its digits is 8640, while the sum is 30.

The square root of 256494 is about 506.4523669606. The cubic root of 256494 is about 63.5368583420.

The spelling of 256494 in words is "two hundred fifty-six thousand, four hundred ninety-four".