26009989 has 2 divisors, whose sum is σ = 26009990. Its totient is φ = 26009988.

The previous prime is 26009947. The next prime is 26010007. The reversal of 26009989 is 98990062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22877089 + 3132900 = 4783^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 26009989 - 2¹⁹ = 25485701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26009089) by changing a digit.

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 as a sum of consecutive naturals, namely, 13004994 + 13004995.

It is an arithmetic number, because the mean of its divisors is an integer number (13004995).

Almost surely, 2^26009989 is an apocalyptic number.

It is an amenable number.

26009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26009989 is an equidigital number, since it uses as much as digits as its factorization.

26009989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 26009989 is about 5099.9989215685. The cubic root of 26009989 is about 296.2875409232.

The spelling of 26009989 in words is "twenty-six million, nine thousand, nine hundred eighty-nine".