26638189 has 2 divisors, whose sum is σ = 26638190. Its totient is φ = 26638188.

The previous prime is 26638181. The next prime is 26638193. The reversal of 26638189 is 98183662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26440164 + 198025 = 5142^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 26638189 - 2³ = 26638181 is a prime.

It is a super-2 number, since 2×26638189² = 1419186226399442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26638181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13319094 + 13319095.

It is an arithmetic number, because the mean of its divisors is an integer number (13319095).

Almost surely, 2^26638189 is an apocalyptic number.

It is an amenable number.

26638189 is a deficient number, since it is larger than the sum of its proper divisors (1).

26638189 is an equidigital number, since it uses as much as digits as its factorization.

26638189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 26638189 is about 5161.2197201824. The cubic root of 26638189 is about 298.6539285984.

The spelling of 26638189 in words is "twenty-six million, six hundred thirty-eight thousand, one hundred eighty-nine".