253205403 has 32 divisors (see below), whose sum is σ = 382648320. Its totient is φ = 147593760.

The previous prime is 253205389. The next prime is 253205417. The reversal of 253205403 is 304502352.

It is an interprime number because it is at equal distance from previous prime (253205389) and next prime (253205417).

It is not a de Polignac number, because 253205403 - 2⁴ = 253205387 is a prime.

It is a super-2 number, since 2×253205403² = 128225952216784818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (253205503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90126 + ... + 92892.

It is an arithmetic number, because the mean of its divisors is an integer number (11957760).

Almost surely, 2^253205403 is an apocalyptic number.

253205403 is a deficient number, since it is larger than the sum of its proper divisors (129442917).

253205403 is a wasteful number, since it uses less digits than its factorization.

253205403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887.

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 253205403 is about 15912.4291985856. The cubic root of 253205403 is about 632.6414691863.

Adding to 253205403 its reverse (304502352), we get a palindrome (557707755).

The spelling of 253205403 in words is "two hundred fifty-three million, two hundred five thousand, four hundred three".