25242440 has 16 divisors (see below), whose sum is σ = 56795580. Its totient is φ = 10096960.

The previous prime is 25242439. The next prime is 25242443. The reversal of 25242440 is 4424252.

It can be written as a sum of positive squares in 2 ways, for example, as 23174596 + 2067844 = 4814^2 + 1438^2 .

It is not an unprimeable number, because it can be changed into a prime (25242443) 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, 315491 + ... + 315570.

Almost surely, 2^25242440 is an apocalyptic number.

25242440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25242440 is an abundant number, since it is smaller than the sum of its proper divisors (31553140).

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

25242440 is a wasteful number, since it uses less digits than its factorization.

25242440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631072 (or 631068 counting only the distinct ones).

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

The square root of 25242440 is about 5024.1855061293. The cubic root of 25242440 is about 293.3439332717.

Adding to 25242440 its reverse (4424252), we get a palindrome (29666692).

The spelling of 25242440 in words is "twenty-five million, two hundred forty-two thousand, four hundred forty".