255806399 has 8 divisors (see below), whose sum is σ = 257685120. Its totient is φ = 253935000.

The previous prime is 255806393. The next prime is 255806401. The reversal of 255806399 is 993608552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255806399 - 2²⁰ = 254757823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255806393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81542 + ... + 84620.

It is an arithmetic number, because the mean of its divisors is an integer number (32210640).

Almost surely, 2^255806399 is an apocalyptic number.

255806399 is a deficient number, since it is larger than the sum of its proper divisors (1878721).

255806399 is a wasteful number, since it uses less digits than its factorization.

255806399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661.

The product of its (nonzero) digits is 583200, while the sum is 47.

The square root of 255806399 is about 15993.9488244773. The cubic root of 255806399 is about 634.8003166545.

The spelling of 255806399 in words is "two hundred fifty-five million, eight hundred six thousand, three hundred ninety-nine".