25424440 has 32 divisors (see below), whose sum is σ = 57995280. Its totient is φ = 10029312.

The previous prime is 25424429. The next prime is 25424447. The reversal of 25424440 is 4442452.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25424447) 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, 1434 + ... + 7273.

Almost surely, 2^25424440 is an apocalyptic number.

25424440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25424440 is an abundant number, since it is smaller than the sum of its proper divisors (32570840).

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

25424440 is a wasteful number, since it uses less digits than its factorization.

25424440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8791 (or 8787 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 25424440 is about 5042.2653639014. The cubic root of 25424440 is about 294.0472566609.

Adding to 25424440 its reverse (4442452), we get a palindrome (29866892).

The spelling of 25424440 in words is "twenty-five million, four hundred twenty-four thousand, four hundred forty".