253309 has 4 divisors (see below), whose sum is σ = 289504. Its totient is φ = 217116.

The previous prime is 253307. The next prime is 253321. The reversal of 253309 is 903352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253309 - 2¹ = 253307 is a prime.

It is a Duffinian number.

253309 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 253309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253307) 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, 18087 + ... + 18100.

It is an arithmetic number, because the mean of its divisors is an integer number (72376).

2²⁵³³⁰⁹ is an apocalyptic number.

It is an amenable number.

253309 is a deficient number, since it is larger than the sum of its proper divisors (36195).

253309 is an equidigital number, since it uses as much as digits as its factorization.

253309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36194.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 253309 is about 503.2981223887. The cubic root of 253309 is about 63.2727737517.

The spelling of 253309 in words is "two hundred fifty-three thousand, three hundred nine".