26581979 has 4 divisors (see below), whose sum is σ = 26594976. Its totient is φ = 26568984.

The previous prime is 26581967. The next prime is 26581987. The reversal of 26581979 is 97918562.

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 26581979 - 2⁴ = 26581963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26581949) 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, 2684 + ... + 7769.

It is an arithmetic number, because the mean of its divisors is an integer number (6648744).

Almost surely, 2^26581979 is an apocalyptic number.

26581979 is a deficient number, since it is larger than the sum of its proper divisors (12997).

26581979 is a wasteful number, since it uses less digits than its factorization.

26581979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12996.

The product of its digits is 272160, while the sum is 47.

The square root of 26581979 is about 5155.7714262756. The cubic root of 26581979 is about 298.4437146207.

The spelling of 26581979 in words is "twenty-six million, five hundred eighty-one thousand, nine hundred seventy-nine".