25943440 has 20 divisors (see below), whose sum is σ = 60318684. Its totient is φ = 10377344.

The previous prime is 25943413. The next prime is 25943441. The reversal of 25943440 is 4434952.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8202496 + 17740944 = 2864^2 + 4212^2 .

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

It is not an unprimeable number, because it can be changed into a prime (25943441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162067 + ... + 162226.

Almost surely, 2^25943440 is an apocalyptic number.

25943440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25943440 is an abundant number, since it is smaller than the sum of its proper divisors (34375244).

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

25943440 is a wasteful number, since it uses less digits than its factorization.

25943440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324306 (or 324300 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 25943440 is about 5093.4703297457. The cubic root of 25943440 is about 296.0346319353.

The spelling of 25943440 in words is "twenty-five million, nine hundred forty-three thousand, four hundred forty".