25695409 has 4 divisors (see below), whose sum is σ = 25922916. Its totient is φ = 25467904.

The previous prime is 25695379. The next prime is 25695413. The reversal of 25695409 is 90459652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 944784 + 24750625 = 972^2 + 4975^2 .

It is a cyclic number.

It is not a de Polignac number, because 25695409 - 2⁵ = 25695377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25695469) 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, 113584 + ... + 113809.

It is an arithmetic number, because the mean of its divisors is an integer number (6480729).

Almost surely, 2^25695409 is an apocalyptic number.

It is an amenable number.

25695409 is a deficient number, since it is larger than the sum of its proper divisors (227507).

25695409 is a wasteful number, since it uses less digits than its factorization.

25695409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227506.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 25695409 is about 5069.0639175295. The cubic root of 25695409 is about 295.0882011472.

The spelling of 25695409 in words is "twenty-five million, six hundred ninety-five thousand, four hundred nine".