Search a number
-
+
256841 = 1323859
BaseRepresentation
bin111110101101001001
3111001022122
4332231021
531204331
65301025
72116544
oct765511
9431278
10256841
11165a72
12104775
138cba0
146985b
155117b
hex3eb49

256841 has 8 divisors (see below), whose sum is σ = 288960. Its totient is φ = 226512.

The previous prime is 256831. The next prime is 256873. The reversal of 256841 is 148652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2k-256841 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 256841.

It is not an unprimeable number, because it can be changed into a prime (256801) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 131 + ... + 728.

It is an arithmetic number, because the mean of its divisors is an integer number (36120).

2256841 is an apocalyptic number.

It is an amenable number.

256841 is a deficient number, since it is larger than the sum of its proper divisors (32119).

256841 is a wasteful number, since it uses less digits than its factorization.

256841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895.

The product of its digits is 1920, while the sum is 26.

The square root of 256841 is about 506.7948302814. The cubic root of 256841 is about 63.5654975500.

It can be divided in two parts, 256 and 841, that multiplied together give a square (215296 = 4642).

The spelling of 256841 in words is "two hundred fifty-six thousand, eight hundred forty-one".

Divisors: 1 13 23 299 859 11167 19757 256841