255236639 has 6 divisors (see below), whose sum is σ = 296907984. Its totient is φ = 218774220.

The previous prime is 255236573. The next prime is 255236651. The reversal of 255236639 is 936632552.

It is a de Polignac number, because none of the positive numbers 2^k-255236639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255236596 and 255236605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255236669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2604407 + ... + 2604504.

It is an arithmetic number, because the mean of its divisors is an integer number (49484664).

Almost surely, 2^255236639 is an apocalyptic number.

255236639 is a deficient number, since it is larger than the sum of its proper divisors (41671345).

255236639 is an equidigital number, since it uses as much as digits as its factorization.

255236639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5208925 (or 5208918 counting only the distinct ones).

The product of its digits is 291600, while the sum is 41.

The square root of 255236639 is about 15976.1271589832. The cubic root of 255236639 is about 634.3286674049.

The spelling of 255236639 in words is "two hundred fifty-five million, two hundred thirty-six thousand, six hundred thirty-nine".