25396440 has 64 divisors (see below), whose sum is σ = 78658560. Its totient is φ = 6552960.

The previous prime is 25396433. The next prime is 25396447. The reversal of 25396440 is 4469352.

It is an interprime number because it is at equal distance from previous prime (25396433) and next prime (25396447).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25396447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (1229040).

Almost surely, 2^25396440 is an apocalyptic number.

25396440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25396440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39329280).

25396440 is an abundant number, since it is smaller than the sum of its proper divisors (53262120).

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

25396440 is a wasteful number, since it uses less digits than its factorization.

25396440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6872 (or 6868 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 25396440 is about 5039.4880692388. The cubic root of 25396440 is about 293.9392720144.

The spelling of 25396440 in words is "twenty-five million, three hundred ninety-six thousand, four hundred forty".