25240 has 16 divisors (see below), whose sum is σ = 56880. Its totient is φ = 10080.

The previous prime is 25237. The next prime is 25243. The reversal of 25240 is 4252.

It is a happy number.

25240 is digitally balanced in base 6, 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 (25237) and next prime (25243).

25240 is strictly pandigital in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 25240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25243) 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, 276 + ... + 355.

It is an arithmetic number, because the mean of its divisors is an integer number (3555).

2²⁵²⁴⁰ is an apocalyptic number.

25240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25240 is an abundant number, since it is smaller than the sum of its proper divisors (31640).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28440).

25240 is a wasteful number, since it uses less digits than its factorization.

25240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 25240 is about 158.8710168659. The cubic root of 25240 is about 29.3334481171. Note that the first 3 decimals are identical.

Adding to 25240 its reverse (4252), we get a palindrome (29492).

It can be divided in two parts, 252 and 40, that added together give a palindrome (292).

The spelling of 25240 in words is "twenty-five thousand, two hundred forty".