25212440 has 32 divisors (see below), whose sum is σ = 61886160. Its totient is φ = 9168000.

The previous prime is 25212433. The next prime is 25212461. The reversal of 25212440 is 4421252.

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 7 ways as a sum of consecutive naturals, for example, 28211 + ... + 29090.

Almost surely, 2^25212440 is an apocalyptic number.

25212440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25212440 is an abundant number, since it is smaller than the sum of its proper divisors (36673720).

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

25212440 is a wasteful number, since it uses less digits than its factorization.

25212440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57323 (or 57319 counting only the distinct ones).

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

The square root of 25212440 is about 5021.1990599856. The cubic root of 25212440 is about 293.2276765942.

Adding to 25212440 its reverse (4421252), we get a palindrome (29633692).

It can be divided in two parts, 25212 and 440, that added together give a palindrome (25652).

The spelling of 25212440 in words is "twenty-five million, two hundred twelve thousand, four hundred forty".