25343440 has 20 divisors (see below), whose sum is σ = 58923684. Its totient is φ = 10137344.

The previous prime is 25343429. The next prime is 25343441. The reversal of 25343440 is 4434352.

It can be written as a sum of positive squares in 2 ways, for example, as 11235904 + 14107536 = 3352^2 + 3756^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25343441) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 158317 + ... + 158476.

Almost surely, 2^25343440 is an apocalyptic number.

25343440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25343440 is an abundant number, since it is smaller than the sum of its proper divisors (33580244).

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

25343440 is a wasteful number, since it uses less digits than its factorization.

25343440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316806 (or 316800 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 25343440 is about 5034.2268522584. The cubic root of 25343440 is about 293.7346550004.

Adding to 25343440 its reverse (4434352), we get a palindrome (29777792).

The spelling of 25343440 in words is "twenty-five million, three hundred forty-three thousand, four hundred forty".