25979945 has 4 divisors (see below), whose sum is σ = 31175940. Its totient is φ = 20783952.

The previous prime is 25979917. The next prime is 25979951. The reversal of 25979945 is 54997952.

It is a happy number.

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 15241216 + 10738729 = 3904^2 + 3277^2 .

It is a cyclic number.

It is not a de Polignac number, because 25979945 - 2¹² = 25975849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25979893 and 25979902.

It is an unprimeable number.

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, 2597990 + ... + 2597999.

It is an arithmetic number, because the mean of its divisors is an integer number (7793985).

Almost surely, 2^25979945 is an apocalyptic number.

It is an amenable number.

25979945 is a deficient number, since it is larger than the sum of its proper divisors (5195995).

25979945 is an equidigital number, since it uses as much as digits as its factorization.

25979945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195994.

The product of its digits is 1020600, while the sum is 50.

The square root of 25979945 is about 5097.0525796778. The cubic root of 25979945 is about 296.1734169162.

The spelling of 25979945 in words is "twenty-five million, nine hundred seventy-nine thousand, nine hundred forty-five".