255840321 has 16 divisors (see below), whose sum is σ = 372642048. Its totient is φ = 154842000.

The previous prime is 255840281. The next prime is 255840337. The reversal of 255840321 is 123048552.

It is not a de Polignac number, because 255840321 - 2⁶ = 255840257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255840391) 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, 21046 + ... + 30896.

It is an arithmetic number, because the mean of its divisors is an integer number (23290128).

Almost surely, 2^255840321 is an apocalyptic number.

It is an amenable number.

255840321 is a deficient number, since it is larger than the sum of its proper divisors (116801727).

255840321 is a wasteful number, since it uses less digits than its factorization.

255840321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10652.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 255840321 is about 15995.0092528889. The cubic root of 255840321 is about 634.8283753018.

Adding to 255840321 its reverse (123048552), we get a palindrome (378888873).

The spelling of 255840321 in words is "two hundred fifty-five million, eight hundred forty thousand, three hundred twenty-one".