26891979 has 4 divisors (see below), whose sum is σ = 35855976. Its totient is φ = 17927984.

The previous prime is 26891947. The next prime is 26891983. The reversal of 26891979 is 97919862.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 26891979 - 2⁵ = 26891947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26891929) 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, 4481994 + ... + 4481999.

It is an arithmetic number, because the mean of its divisors is an integer number (8963994).

Almost surely, 2^26891979 is an apocalyptic number.

26891979 is a deficient number, since it is larger than the sum of its proper divisors (8963997).

26891979 is an equidigital number, since it uses as much as digits as its factorization.

26891979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8963996.

The product of its digits is 489888, while the sum is 51.

The square root of 26891979 is about 5185.7476799397. The cubic root of 26891979 is about 299.5993874924.

The spelling of 26891979 in words is "twenty-six million, eight hundred ninety-one thousand, nine hundred seventy-nine".