26186989 has 2 divisors, whose sum is σ = 26186990. Its totient is φ = 26186988.

The previous prime is 26186983. The next prime is 26187011. The reversal of 26186989 is 98968162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 9253764 = 4115^2 + 3042^2 .

It is a cyclic number.

It is not a de Polignac number, because 26186989 - 2³ = 26186981 is a prime.

It is a super-2 number, since 2×26186989² = 1371516785772242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26186981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13093494 + 13093495.

It is an arithmetic number, because the mean of its divisors is an integer number (13093495).

Almost surely, 2^26186989 is an apocalyptic number.

It is an amenable number.

26186989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26186989 is an equidigital number, since it uses as much as digits as its factorization.

26186989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 49.

The square root of 26186989 is about 5117.3224444039. The cubic root of 26186989 is about 296.9581087209.

The spelling of 26186989 in words is "twenty-six million, one hundred eighty-six thousand, nine hundred eighty-nine".