25874509 has 4 divisors (see below), whose sum is σ = 26313120. Its totient is φ = 25435900.

The previous prime is 25874501. The next prime is 25874531. The reversal of 25874509 is 90547852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25874509 - 2³ = 25874501 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25874501) 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, 219217 + ... + 219334.

It is an arithmetic number, because the mean of its divisors is an integer number (6578280).

Almost surely, 2^25874509 is an apocalyptic number.

It is an amenable number.

25874509 is a deficient number, since it is larger than the sum of its proper divisors (438611).

25874509 is an equidigital number, since it uses as much as digits as its factorization.

25874509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438610.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 25874509 is about 5086.6992244480. The cubic root of 25874509 is about 295.7722141188.

The spelling of 25874509 in words is "twenty-five million, eight hundred seventy-four thousand, five hundred nine".