253443 has 4 divisors (see below), whose sum is σ = 337928. Its totient is φ = 168960.

The previous prime is 253439. The next prime is 253447. The reversal of 253443 is 344352.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (253439) and next prime (253447).

It is not a de Polignac number, because 253443 - 2² = 253439 is a prime.

It is a d-powerful number, because it can be written as 2¹³ + 5³ + 4⁴ + 3⁷ + 4⁸ + 3¹¹ .

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253447) 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, 42238 + ... + 42243.

It is an arithmetic number, because the mean of its divisors is an integer number (84482).

2²⁵³⁴⁴³ is an apocalyptic number.

253443 is a deficient number, since it is larger than the sum of its proper divisors (84485).

253443 is an equidigital number, since it uses as much as digits as its factorization.

253443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84484.

The product of its digits is 1440, while the sum is 21.

The square root of 253443 is about 503.4312266834. The cubic root of 253443 is about 63.2839288456.

Adding to 253443 its reverse (344352), we get a palindrome (597795).

Subtracting 253443 from its reverse (344352), we obtain a palindrome (90909).

It can be divided in two parts, 253 and 443, that added together give a palindrome (696).

The spelling of 253443 in words is "two hundred fifty-three thousand, four hundred forty-three".