25443 has 12 divisors (see below), whose sum is σ = 40248. Its totient is φ = 15360.

The previous prime is 25439. The next prime is 25447. The reversal of 25443 is 34452.

It is a happy number.

25443 is nontrivially palindromic in base 2.

25443 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (25439) and next prime (25447).

It is not a de Polignac number, because 25443 - 2² = 25439 is a prime.

25443 is an undulating number in base 16.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (25447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30 + ... + 227.

It is an arithmetic number, because the mean of its divisors is an integer number (3354).

2²⁵⁴⁴³ is an apocalyptic number.

25443 is a deficient number, since it is larger than the sum of its proper divisors (14805).

25443 is a wasteful number, since it uses less digits than its factorization.

25443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 271 counting only the distinct ones).

The product of its digits is 480, while the sum is 18.

The square root of 25443 is about 159.5086204567. The cubic root of 25443 is about 29.4118791368.

Subtracting from 25443 its sum of digits (18), we obtain a triangular number (25425 = T₂₂₅).

Adding to 25443 its reverse (34452), we get a palindrome (59895).

Subtracting 25443 from its reverse (34452), we obtain a palindrome (9009).

It can be divided in two parts, 2 and 5443, that added together give a palindrome (5445).

The spelling of 25443 in words is "twenty-five thousand, four hundred forty-three".