25799409 has 24 divisors (see below), whose sum is σ = 38937600. Its totient is φ = 16441920.

The previous prime is 25799363. The next prime is 25799413. The reversal of 25799409 is 90499752.

It is not a de Polignac number, because 25799409 - 2¹⁹ = 25275121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25799479) 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 23 ways as a sum of consecutive naturals, for example, 24312 + ... + 25350.

It is an arithmetic number, because the mean of its divisors is an integer number (1622400).

Almost surely, 2^25799409 is an apocalyptic number.

It is an amenable number.

25799409 is a deficient number, since it is larger than the sum of its proper divisors (13138191).

25799409 is a wasteful number, since it uses less digits than its factorization.

25799409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 25799409 is about 5079.3118628413. The cubic root of 25799409 is about 295.4857801054.

The spelling of 25799409 in words is "twenty-five million, seven hundred ninety-nine thousand, four hundred nine".