255639384 has 192 divisors, whose sum is σ = 929859840. Its totient is φ = 61274880.

The previous prime is 255639331. The next prime is 255639403. The reversal of 255639384 is 483936552.

255639384 is a `hidden beast` number, since 2 + 5 + 5 + 639 + 3 + 8 + 4 = 666.

255639384 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70299 + ... + 73845.

It is an arithmetic number, because the mean of its divisors is an integer number (4843020).

Almost surely, 2^255639384 is an apocalyptic number.

255639384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255639384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464929920).

255639384 is an abundant number, since it is smaller than the sum of its proper divisors (674220456).

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

255639384 is a wasteful number, since it uses less digits than its factorization.

255639384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590 (or 3583 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 255639384 is about 15988.7267785775. The cubic root of 255639384 is about 634.6621336937.

The spelling of 255639384 in words is "two hundred fifty-five million, six hundred thirty-nine thousand, three hundred eighty-four".