25442140 has 96 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 8870400.

The previous prime is 25442119. The next prime is 25442161. The reversal of 25442140 is 4124452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25442119) and next prime (25442161).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358305 + ... + 358375.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^25442140 is an apocalyptic number.

25442140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25442140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

25442140 is an abundant number, since it is smaller than the sum of its proper divisors (35521700).

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

25442140 is a wasteful number, since it uses less digits than its factorization.

25442140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 25442140 is about 5044.0202220055. The cubic root of 25442140 is about 294.1154774899.

Adding to 25442140 its reverse (4124452), we get a palindrome (29566592).

The spelling of 25442140 in words is "twenty-five million, four hundred forty-two thousand, one hundred forty".