26639189 has 2 divisors, whose sum is σ = 26639190. Its totient is φ = 26639188.

The previous prime is 26639183. The next prime is 26639191. The reversal of 26639189 is 98193662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26604964 + 34225 = 5158^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 26639189 - 2¹⁶ = 26573653 is a prime.

It is a super-5 number, since 5×26639189⁵ (a number of 38 digits) contains 55555 as substring.

Together with 26639191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26639183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13319594 + 13319595.

It is an arithmetic number, because the mean of its divisors is an integer number (13319595).

Almost surely, 2^26639189 is an apocalyptic number.

It is an amenable number.

26639189 is a deficient number, since it is larger than the sum of its proper divisors (1).

26639189 is an equidigital number, since it uses as much as digits as its factorization.

26639189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 26639189 is about 5161.3165955985. The cubic root of 26639189 is about 298.6576657167.

The spelling of 26639189 in words is "twenty-six million, six hundred thirty-nine thousand, one hundred eighty-nine".