25424 has 20 divisors (see below), whose sum is σ = 56544. Its totient is φ = 10848.

The previous prime is 25423. The next prime is 25439. The reversal of 25424 is 42452.

It is a plaindrome in base 9 and base 15.

It is a zygodrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25424.

It is not an unprimeable number, because it can be changed into a prime (25423) 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, 2 + ... + 225.

2²⁵⁴²⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28272).

25424 is an abundant number, since it is smaller than the sum of its proper divisors (31120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25424 is a wasteful number, since it uses less digits than its factorization.

25424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 236 counting only the distinct ones).

The product of its digits is 320, while the sum is 17.

The square root of 25424 is about 159.4490514240. The cubic root of 25424 is about 29.4045560373.

Adding to 25424 its reverse (42452), we get a palindrome (67876).

The spelling of 25424 in words is "twenty-five thousand, four hundred twenty-four".