25252440 has 32 divisors (see below), whose sum is σ = 75757680. Its totient is φ = 6733952.

The previous prime is 25252439. The next prime is 25252441. The reversal of 25252440 is 4425252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25252439) and next prime (25252441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25252440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25252441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105099 + ... + 105338.

Almost surely, 2^25252440 is an apocalyptic number.

25252440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25252440 is an abundant number, since it is smaller than the sum of its proper divisors (50505240).

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

25252440 is a wasteful number, since it uses less digits than its factorization.

25252440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210451 (or 210447 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 25252440 is about 5025.1805937697. The cubic root of 25252440 is about 293.3826650273.

Adding to 25252440 its reverse (4425252), we get a palindrome (29677692).

The spelling of 25252440 in words is "twenty-five million, two hundred fifty-two thousand, four hundred forty".