255405403 has 4 divisors (see below), whose sum is σ = 278624088. Its totient is φ = 232186720.

The previous prime is 255405377. The next prime is 255405419. The reversal of 255405403 is 304504552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255405403 - 2¹³ = 255397211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255405443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11609326 + ... + 11609347.

It is an arithmetic number, because the mean of its divisors is an integer number (69656022).

Almost surely, 2^255405403 is an apocalyptic number.

255405403 is a deficient number, since it is larger than the sum of its proper divisors (23218685).

255405403 is a wasteful number, since it uses less digits than its factorization.

255405403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23218684.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 255405403 is about 15981.4080418466. The cubic root of 255405403 is about 634.4684439117.

Adding to 255405403 its reverse (304504552), we get a palindrome (559909955).

The spelling of 255405403 in words is "two hundred fifty-five million, four hundred five thousand, four hundred three".