255243405 has 32 divisors (see below), whose sum is σ = 416052864. Its totient is φ = 133595136.

The previous prime is 255243379. The next prime is 255243421. The reversal of 255243405 is 504342552.

It is not a de Polignac number, because 255243405 - 2⁷ = 255243277 is a prime.

It is a congruent number.

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, 280962 + ... + 281868.

It is an arithmetic number, because the mean of its divisors is an integer number (13001652).

Almost surely, 2^255243405 is an apocalyptic number.

It is an amenable number.

255243405 is a deficient number, since it is larger than the sum of its proper divisors (160809459).

255243405 is a wasteful number, since it uses less digits than its factorization.

255243405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245.

The product of its (nonzero) digits is 24000, while the sum is 30.

The square root of 255243405 is about 15976.3389110271. The cubic root of 255243405 is about 634.3342724385.

Adding to 255243405 its reverse (504342552), we get a palindrome (759585957).

The spelling of 255243405 in words is "two hundred fifty-five million, two hundred forty-three thousand, four hundred five".