25442240 has 56 divisors (see below), whose sum is σ = 62026800. Its totient is φ = 9940224.

The previous prime is 25442233. The next prime is 25442269. The reversal of 25442240 is 4224452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591659 + ... + 591701.

Almost surely, 2^25442240 is an apocalyptic number.

25442240 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 25442240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31013400).

25442240 is an abundant number, since it is smaller than the sum of its proper divisors (36584560).

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

25442240 is an frugal number, since it uses more digits than its factorization.

25442240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 25442240 is about 5044.0301347236. The cubic root of 25442240 is about 294.1158628284.

Adding to 25442240 its reverse (4224452), we get a palindrome (29666692).

The spelling of 25442240 in words is "twenty-five million, four hundred forty-two thousand, two hundred forty".