255881940 has 48 divisors (see below), whose sum is σ = 723183552. Its totient is φ = 67595776.

The previous prime is 255881939. The next prime is 255881963. The reversal of 255881940 is 49188552.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 255881892 and 255881901.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13509 + ... + 26348.

It is an arithmetic number, because the mean of its divisors is an integer number (15066324).

Almost surely, 2^255881940 is an apocalyptic number.

255881940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255881940 is an abundant number, since it is smaller than the sum of its proper divisors (467301612).

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

255881940 is a wasteful number, since it uses less digits than its factorization.

255881940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39976 (or 39974 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 255881940 is about 15996.3101995429. The cubic root of 255881940 is about 634.8627971494.

The spelling of 255881940 in words is "two hundred fifty-five million, eight hundred eighty-one thousand, nine hundred forty".