25425409 has 4 divisors (see below), whose sum is σ = 25467904. Its totient is φ = 25382916.

The previous prime is 25425403. The next prime is 25425451. The reversal of 25425409 is 90452452.

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 25425409 - 2¹¹ = 25423361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25425403) 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, 20337 + ... + 21550.

It is an arithmetic number, because the mean of its divisors is an integer number (6366976).

Almost surely, 2^25425409 is an apocalyptic number.

It is an amenable number.

25425409 is a deficient number, since it is larger than the sum of its proper divisors (42495).

25425409 is an equidigital number, since it uses as much as digits as its factorization.

25425409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42494.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 25425409 is about 5042.3614507490. The cubic root of 25425409 is about 294.0509922813.

The spelling of 25425409 in words is "twenty-five million, four hundred twenty-five thousand, four hundred nine".