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256945 = 5135967
BaseRepresentation
bin111110101110110001
3111001110111
4332232301
531210240
65301321
72120053
oct765661
9431414
10256945
11166057
12104841
138cc50
14698d3
15511ea
hex3ebb1

256945 has 16 divisors (see below), whose sum is σ = 342720. Its totient is φ = 183744.

The previous prime is 256939. The next prime is 256957. The reversal of 256945 is 549652.

It is a cyclic number.

It is not a de Polignac number, because 256945 - 213 = 248753 is a prime.

It is an alternating number because its digits alternate between even and odd.

Its product of digits (10800) is a multiple of the sum of its prime divisors (144).

256945 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3802 + ... + 3868.

It is an arithmetic number, because the mean of its divisors is an integer number (21420).

2256945 is an apocalyptic number.

It is an amenable number.

256945 is a deficient number, since it is larger than the sum of its proper divisors (85775).

256945 is a wasteful number, since it uses less digits than its factorization.

256945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144.

The product of its digits is 10800, while the sum is 31.

The square root of 256945 is about 506.8974255212. The cubic root of 256945 is about 63.5740760345.

The spelling of 256945 in words is "two hundred fifty-six thousand, nine hundred forty-five".

Divisors: 1 5 13 59 65 67 295 335 767 871 3835 3953 4355 19765 51389 256945