255623 has 4 divisors (see below), whose sum is σ = 258120. Its totient is φ = 253128.

The previous prime is 255617. The next prime is 255637. The reversal of 255623 is 326552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255623 - 2¹² = 251527 is a prime.

It is a d-powerful number, because it can be written as 2⁶ + 5² + 6 + 5⁷ + 2⁸ + 3¹¹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255613) 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 3 ways as a sum of consecutive naturals, for example, 1088 + ... + 1301.

It is an arithmetic number, because the mean of its divisors is an integer number (64530).

2²⁵⁵⁶²³ is an apocalyptic number.

255623 is a deficient number, since it is larger than the sum of its proper divisors (2497).

255623 is a wasteful number, since it uses less digits than its factorization.

255623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496.

The product of its digits is 1800, while the sum is 23.

The square root of 255623 is about 505.5917325273. The cubic root of 255623 is about 63.4648574846.

It can be divided in two parts, 255 and 623, that added together give a palindrome (878).

The spelling of 255623 in words is "two hundred fifty-five thousand, six hundred twenty-three".