25340809 has 8 divisors (see below), whose sum is σ = 28231560. Its totient is φ = 22584576.

The previous prime is 25340801. The next prime is 25340873. The reversal of 25340809 is 90804352.

It can be written as a sum of positive squares in 4 ways, for example, as 4665600 + 20675209 = 2160^2 + 4547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25340809 - 2³ = 25340801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25340801) 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 7 ways as a sum of consecutive naturals, for example, 33232 + ... + 33985.

It is an arithmetic number, because the mean of its divisors is an integer number (3528945).

Almost surely, 2^25340809 is an apocalyptic number.

25340809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

25340809 is a deficient number, since it is larger than the sum of its proper divisors (2890751).

25340809 is a wasteful number, since it uses less digits than its factorization.

25340809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67259.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 25340809 is about 5033.9655342483. The cubic root of 25340809 is about 293.7244900738.

The spelling of 25340809 in words is "twenty-five million, three hundred forty thousand, eight hundred nine".