25819440 has 40 divisors (see below), whose sum is σ = 80041008. Its totient is φ = 6885120.

The previous prime is 25819397. The next prime is 25819441. The reversal of 25819440 is 4491852.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (25819441) 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, 53551 + ... + 54030.

Almost surely, 2^25819440 is an apocalyptic number.

25819440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25819440 is an abundant number, since it is smaller than the sum of its proper divisors (54221568).

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

25819440 is a wasteful number, since it uses less digits than its factorization.

25819440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107597 (or 107591 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 25819440 is about 5081.2833024739. The cubic root of 25819440 is about 295.5622333359.

It can be divided in two parts, 2581 and 9440, that added together give a palindrome (12021).

The spelling of 25819440 in words is "twenty-five million, eight hundred nineteen thousand, four hundred forty".