255839985 has 32 divisors (see below), whose sum is σ = 456382080. Its totient is φ = 135981504.

The previous prime is 255839963. The next prime is 255840029. The reversal of 255839985 is 589938552.

255839985 is a `hidden beast` number, since 2 + 558 + 3 + 9 + 9 + 85 = 666.

It is not a de Polignac number, because 255839985 - 2¹² = 255835889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38359 + ... + 44531.

It is an arithmetic number, because the mean of its divisors is an integer number (14261940).

Almost surely, 2^255839985 is an apocalyptic number.

It is an amenable number.

255839985 is a deficient number, since it is larger than the sum of its proper divisors (200542095).

255839985 is a wasteful number, since it uses less digits than its factorization.

255839985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6494 (or 6488 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The square root of 255839985 is about 15994.9987496092. The cubic root of 255839985 is about 634.8280973909.

The spelling of 255839985 in words is "two hundred fifty-five million, eight hundred thirty-nine thousand, nine hundred eighty-five".