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256460 = 22512823

256460 has 12 divisors (see below), whose sum is σ = 538608. Its totient is φ = 102576.

The previous prime is 256441. The next prime is 256469. The reversal of 256460 is 64652.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (256469) by changing a digit.

256460 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6392 + ... + 6431.

It is an arithmetic number, because the mean of its divisors is an integer number (44884).

2256460 is an apocalyptic number.

256460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256460 is an abundant number, since it is smaller than the sum of its proper divisors (282148).

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

256460 is a wasteful number, since it uses less digits than its factorization.

256460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12832 (or 12830 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 256460 is about 506.4187990192. The cubic root of 256460 is about 63.5340508057.

The spelling of 256460 in words is "two hundred fifty-six thousand, four hundred sixty".

Divisors: 1 2 4 5 10 20 12823 25646 51292 64115 128230 256460