25690409 has 4 divisors (see below), whose sum is σ = 26000016. Its totient is φ = 25380804.

The previous prime is 25690403. The next prime is 25690411. The reversal of 25690409 is 90409652.

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 a de Polignac number, because none of the positive numbers 2^k-25690409 is a prime.

It is a super-2 number, since 2×25690409² = 1319994229174562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25690403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154679 + ... + 154844.

It is an arithmetic number, because the mean of its divisors is an integer number (6500004).

Almost surely, 2^25690409 is an apocalyptic number.

It is an amenable number.

25690409 is a deficient number, since it is larger than the sum of its proper divisors (309607).

25690409 is an equidigital number, since it uses as much as digits as its factorization.

25690409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309606.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 25690409 is about 5068.5707058302. The cubic root of 25690409 is about 295.0690597678.

The spelling of 25690409 in words is "twenty-five million, six hundred ninety thousand, four hundred nine".