25243440 has 80 divisors (see below), whose sum is σ = 79066368. Its totient is φ = 6661888.

The previous prime is 25243429. The next prime is 25243481. The reversal of 25243440 is 4434252.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25243440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25189 + ... + 26171.

Almost surely, 2^25243440 is an apocalyptic number.

25243440 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 25243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39533184).

25243440 is an abundant number, since it is smaller than the sum of its proper divisors (53822928).

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

25243440 is a wasteful number, since it uses less digits than its factorization.

25243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 25243440 is about 5024.2850237621. The cubic root of 25243440 is about 293.3478069075.

Adding to 25243440 its reverse (4434252), we get a palindrome (29677692).

The spelling of 25243440 in words is "twenty-five million, two hundred forty-three thousand, four hundred forty".