25390240 has 48 divisors (see below), whose sum is σ = 61931520. Its totient is φ = 9826560.

The previous prime is 25390223. The next prime is 25390249. The reversal of 25390240 is 4209352.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25390249) 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, 2401 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (1290240).

Almost surely, 2^25390240 is an apocalyptic number.

25390240 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 25390240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30965760).

25390240 is an abundant number, since it is smaller than the sum of its proper divisors (36541280).

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

25390240 is a wasteful number, since it uses less digits than its factorization.

25390240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165 (or 5157 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 25390240 is about 5038.8728898435. The cubic root of 25390240 is about 293.9153503964.

Adding to 25390240 its reverse (4209352), we get a palindrome (29599592).

The spelling of 25390240 in words is "twenty-five million, three hundred ninety thousand, two hundred forty".