25388440 has 64 divisors (see below), whose sum is σ = 71228160. Its totient is φ = 7912320.

The previous prime is 25388387. The next prime is 25388459. The reversal of 25388440 is 4488352.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 25388396 and 25388405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1042 + ... + 7201.

It is an arithmetic number, because the mean of its divisors is an integer number (1112940).

Almost surely, 2^25388440 is an apocalyptic number.

25388440 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 25388440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35614080).

25388440 is an abundant number, since it is smaller than the sum of its proper divisors (45839720).

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

25388440 is a wasteful number, since it uses less digits than its factorization.

25388440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 25388440 is about 5038.6942753059. The cubic root of 25388440 is about 293.9084046811.

The spelling of 25388440 in words is "twenty-five million, three hundred eighty-eight thousand, four hundred forty".