255863421 has 16 divisors (see below), whose sum is σ = 413517120. Its totient is φ = 155068560.

The previous prime is 255863407. The next prime is 255863423. The reversal of 255863421 is 124368552.

255863421 is a `hidden beast` number, since 2 + 558 + 63 + 42 + 1 = 666.

255863421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 255863421 - 2⁶ = 255863357 is a prime.

It is a super-3 number, since 3×255863421³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255863423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430450 + ... + 431043.

It is an arithmetic number, because the mean of its divisors is an integer number (25844820).

Almost surely, 2^255863421 is an apocalyptic number.

It is an amenable number.

255863421 is a deficient number, since it is larger than the sum of its proper divisors (157653699).

255863421 is a wasteful number, since it uses less digits than its factorization.

255863421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861513 (or 861507 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 255863421 is about 15995.7313368286. The cubic root of 255863421 is about 634.8474810915.

The spelling of 255863421 in words is "two hundred fifty-five million, eight hundred sixty-three thousand, four hundred twenty-one".