255559940 has 24 divisors (see below), whose sum is σ = 542709720. Its totient is φ = 101074688.

The previous prime is 255559921. The next prime is 255559949. The reversal of 255559940 is 49955552.

It can be written as a sum of positive squares in 4 ways, for example, as 47969476 + 207590464 = 6926^2 + 14408^2 .

It is a junction number, because it is equal to n+sod(n) for n = 255559891 and 255559900.

It is not an unprimeable number, because it can be changed into a prime (255559949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70007 + ... + 73566.

It is an arithmetic number, because the mean of its divisors is an integer number (22612905).

Almost surely, 2^255559940 is an apocalyptic number.

255559940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255559940 is an abundant number, since it is smaller than the sum of its proper divisors (287149780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255559940 is a wasteful number, since it uses less digits than its factorization.

255559940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143671 (or 143669 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 44.

The square root of 255559940 is about 15986.2422101005. The cubic root of 255559940 is about 634.5963831018.

The spelling of 255559940 in words is "two hundred fifty-five million, five hundred fifty-nine thousand, nine hundred forty".