26721979 has 2 divisors, whose sum is σ = 26721980. Its totient is φ = 26721978.

The previous prime is 26721971. The next prime is 26721997. The reversal of 26721979 is 97912762.

Together with next prime (26721997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26721979 - 2³ = 26721971 is a prime.

It is not a weakly prime, because it can be changed into another prime (26721971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13360989 + 13360990.

It is an arithmetic number, because the mean of its divisors is an integer number (13360990).

Almost surely, 2^26721979 is an apocalyptic number.

26721979 is a deficient number, since it is larger than the sum of its proper divisors (1).

26721979 is an equidigital number, since it uses as much as digits as its factorization.

26721979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 26721979 is about 5169.3306143059. The cubic root of 26721979 is about 298.9667379098.

The spelling of 26721979 in words is "twenty-six million, seven hundred twenty-one thousand, nine hundred seventy-nine".