253530403 has 16 divisors (see below), whose sum is σ = 305141760. Its totient is φ = 205942176.

The previous prime is 253530391. The next prime is 253530413. The reversal of 253530403 is 304035352.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 253530403 - 2⁵ = 253530371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253530413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10326 + ... + 24772.

It is an arithmetic number, because the mean of its divisors is an integer number (19071360).

Almost surely, 2^253530403 is an apocalyptic number.

253530403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

253530403 is a deficient number, since it is larger than the sum of its proper divisors (51611357).

253530403 is a wasteful number, since it uses less digits than its factorization.

253530403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14586.

The product of its (nonzero) digits is 5400, while the sum is 25.

The square root of 253530403 is about 15922.6380666019. The cubic root of 253530403 is about 632.9120276191.

Adding to 253530403 its reverse (304035352), we get a palindrome (557565755).

The spelling of 253530403 in words is "two hundred fifty-three million, five hundred thirty thousand, four hundred three".