256039 has 8 divisors (see below), whose sum is σ = 296960. Its totient is φ = 216216.

The previous prime is 256033. The next prime is 256049. The reversal of 256039 is 930652.

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

It is not a de Polignac number, because 256039 - 2³ = 256031 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 5⁷ + 0 + 6 + 3¹¹ + 9³ .

It is a Duffinian number.

256039 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322 + ... + 784.

It is an arithmetic number, because the mean of its divisors is an integer number (37120).

256039 is a Friedman number, since it can be written as 506^2+9/3, using all its digits and the basic arithmetic operations.

2²⁵⁶⁰³⁹ is an apocalyptic number.

256039 is a deficient number, since it is larger than the sum of its proper divisors (40921).

256039 is an equidigital number, since it uses as much as digits as its factorization.

256039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 256039 is about 506.0029644182. The cubic root of 256039 is about 63.4992663234.

It can be divided in two parts, 25 and 6039, that multiplied together give a triangular number (150975 = T₅₄₉).

The spelling of 256039 in words is "two hundred fifty-six thousand, thirty-nine".