255646 has 16 divisors (see below), whose sum is σ = 415584. Its totient is φ = 117504.

The previous prime is 255641. The next prime is 255649. The reversal of 255646 is 646552.

255646 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255641) 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, 2431 + ... + 2533.

It is an arithmetic number, because the mean of its divisors is an integer number (25974).

2²⁵⁵⁶⁴⁶ is an apocalyptic number.

255646 is a deficient number, since it is larger than the sum of its proper divisors (159938).

255646 is a wasteful number, since it uses less digits than its factorization.

255646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195.

The product of its digits is 7200, while the sum is 28.

The square root of 255646 is about 505.6144776408. The cubic root of 255646 is about 63.4667608709.

It can be divided in two parts, 25 and 5646, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 255646 in words is "two hundred fifty-five thousand, six hundred forty-six".