255403 has 4 divisors (see below), whose sum is σ = 264240. Its totient is φ = 246568.

The previous prime is 255383. The next prime is 255413. The reversal of 255403 is 304552.

It is a happy number.

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 255403 - 2⁵ = 255371 is a prime.

It is a d-powerful number, because it can be written as 2 + 5³ + 4 + 5⁷ + 0 + 3¹¹ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4375 + ... + 4432.

It is an arithmetic number, because the mean of its divisors is an integer number (66060).

2²⁵⁵⁴⁰³ is an apocalyptic number.

255403 is a deficient number, since it is larger than the sum of its proper divisors (8837).

255403 is an equidigital number, since it uses as much as digits as its factorization.

255403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8836.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 255403 is about 505.3741188466. The cubic root of 255403 is about 63.4466454092.

Adding to 255403 its reverse (304552), we get a palindrome (559955).

The spelling of 255403 in words is "two hundred fifty-five thousand, four hundred three".