25567409 has 4 divisors (see below), whose sum is σ = 29219904. Its totient is φ = 21914916.

The previous prime is 25567397. The next prime is 25567427. The reversal of 25567409 is 90476552.

It is a happy number.

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 25567409 - 2⁴ = 25567393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25567459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826237 + ... + 1826250.

It is an arithmetic number, because the mean of its divisors is an integer number (7304976).

Almost surely, 2^25567409 is an apocalyptic number.

It is an amenable number.

25567409 is a deficient number, since it is larger than the sum of its proper divisors (3652495).

25567409 is an equidigital number, since it uses as much as digits as its factorization.

25567409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652494.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 25567409 is about 5056.4225495898. The cubic root of 25567409 is about 294.5973977473.

The spelling of 25567409 in words is "twenty-five million, five hundred sixty-seven thousand, four hundred nine".