25140 has 24 divisors (see below), whose sum is σ = 70560. Its totient is φ = 6688.

The previous prime is 25127. The next prime is 25147. The reversal of 25140 is 4152.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25147) by changing a digit.

25140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150 + ... + 269.

It is an arithmetic number, because the mean of its divisors is an integer number (2940).

2²⁵¹⁴⁰ is an apocalyptic number.

25140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25140 is an abundant number, since it is smaller than the sum of its proper divisors (45420).

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 (35280).

25140 is a wasteful number, since it uses less digits than its factorization.

25140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 25140 is about 158.5559838038. Note that the first 3 decimals coincide. The cubic root of 25140 is about 29.2946574766.

Adding to 25140 its sum of digits (12), we get a palindrome (25152).

Adding to 25140 its reverse (4152), we get a palindrome (29292).

The spelling of 25140 in words is "twenty-five thousand, one hundred forty".