25425240 has 32 divisors (see below), whose sum is σ = 76276080. Its totient is φ = 6780032.

The previous prime is 25425223. The next prime is 25425269. The reversal of 25425240 is 4252452.

It is a happy number.

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 25425240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105819 + ... + 106058.

Almost surely, 2^25425240 is an apocalyptic number.

25425240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25425240 is an abundant number, since it is smaller than the sum of its proper divisors (50850840).

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

25425240 is a wasteful number, since it uses less digits than its factorization.

25425240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211891 (or 211887 counting only the distinct ones).

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

The square root of 25425240 is about 5042.3446927000. The cubic root of 25425240 is about 294.0503407713.

Adding to 25425240 its reverse (4252452), we get a palindrome (29677692).

The spelling of 25425240 in words is "twenty-five million, four hundred twenty-five thousand, two hundred forty".