25242140 has 96 divisors (see below), whose sum is σ = 68027904. Its totient is φ = 7637760.

The previous prime is 25242137. The next prime is 25242163. The reversal of 25242140 is 4124252.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 56759 + ... + 57201.

It is an arithmetic number, because the mean of its divisors is an integer number (708624).

Almost surely, 2^25242140 is an apocalyptic number.

25242140 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 25242140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34013952).

25242140 is an abundant number, since it is smaller than the sum of its proper divisors (42785764).

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

25242140 is a wasteful number, since it uses less digits than its factorization.

25242140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 25242140 is about 5024.1556504551. The cubic root of 25242140 is about 293.3427711610.

Adding to 25242140 its reverse (4124252), we get a palindrome (29366392).

It can be divided in two parts, 2524 and 2140, that added together give a palindrome (4664).

The spelling of 25242140 in words is "twenty-five million, two hundred forty-two thousand, one hundred forty".