26989187 has 2 divisors, whose sum is σ = 26989188. Its totient is φ = 26989186.

The previous prime is 26989181. The next prime is 26989199. The reversal of 26989187 is 78198962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26989187 - 2²² = 22794883 is a prime.

It is not a weakly prime, because it can be changed into another prime (26989181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13494593 + 13494594.

It is an arithmetic number, because the mean of its divisors is an integer number (13494594).

Almost surely, 2^26989187 is an apocalyptic number.

26989187 is a deficient number, since it is larger than the sum of its proper divisors (1).

26989187 is an equidigital number, since it uses as much as digits as its factorization.

26989187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 26989187 is about 5195.1118371023. Note that the first 3 decimals coincide. The cubic root of 26989187 is about 299.9599465045.

The spelling of 26989187 in words is "twenty-six million, nine hundred eighty-nine thousand, one hundred eighty-seven".