26249945 has 4 divisors (see below), whose sum is σ = 31499940. Its totient is φ = 20999952.

The previous prime is 26249939. The next prime is 26249953. The reversal of 26249945 is 54994262.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54994262 = 2 ⋅27497131.

It can be written as a sum of positive squares in 2 ways, for example, as 16540489 + 9709456 = 4067^2 + 3116^2 .

It is a cyclic number.

It is not a de Polignac number, because 26249945 - 2²⁰ = 25201369 is a prime.

It is a super-3 number, since 3×26249945³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 2624990 + ... + 2624999.

It is an arithmetic number, because the mean of its divisors is an integer number (7874985).

Almost surely, 2^26249945 is an apocalyptic number.

It is an amenable number.

26249945 is a deficient number, since it is larger than the sum of its proper divisors (5249995).

26249945 is an equidigital number, since it uses as much as digits as its factorization.

26249945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5249994.

The product of its digits is 155520, while the sum is 41.

The square root of 26249945 is about 5123.4700155266. The cubic root of 26249945 is about 297.1958900725.

The spelling of 26249945 in words is "twenty-six million, two hundred forty-nine thousand, nine hundred forty-five".