256940 has 24 divisors (see below), whose sum is σ = 559440. Its totient is φ = 99008.

The previous prime is 256939. The next prime is 256957. The reversal of 256940 is 49652.

256940 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359 + ... + 801.

It is an arithmetic number, because the mean of its divisors is an integer number (23310).

2²⁵⁶⁹⁴⁰ is an apocalyptic number.

256940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279720).

256940 is an abundant number, since it is smaller than the sum of its proper divisors (302500).

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

256940 is a wasteful number, since it uses less digits than its factorization.

256940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 256940 is about 506.8924935329. The cubic root of 256940 is about 63.5736636604.

The spelling of 256940 in words is "two hundred fifty-six thousand, nine hundred forty".