255783 has 16 divisors (see below), whose sum is σ = 389376. Its totient is φ = 147840.

The previous prime is 255767. The next prime is 255803. The reversal of 255783 is 387552.

It is a happy number.

It is not a de Polignac number, because 255783 - 2⁴ = 255767 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 255783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 591 + ... + 927.

It is an arithmetic number, because the mean of its divisors is an integer number (24336).

2²⁵⁵⁷⁸³ is an apocalyptic number.

255783 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

255783 is a deficient number, since it is larger than the sum of its proper divisors (133593).

255783 is a wasteful number, since it uses less digits than its factorization.

255783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374.

The product of its digits is 8400, while the sum is 30.

The square root of 255783 is about 505.7499382106. The cubic root of 255783 is about 63.4780960681.

Subtracting 255783 from its reverse (387552), we obtain a square (131769 = 363²).

The spelling of 255783 in words is "two hundred fifty-five thousand, seven hundred eighty-three".