18736889 has 2 divisors, whose sum is σ = 18736890. Its totient is φ = 18736888.

The previous prime is 18736859. The next prime is 18736891. The reversal of 18736889 is 98863781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13446889 + 5290000 = 3667^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 18736889 - 2¹⁶ = 18671353 is a prime.

Together with 18736891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18736819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368444 + 9368445.

It is an arithmetic number, because the mean of its divisors is an integer number (9368445).

Almost surely, 2^18736889 is an apocalyptic number.

It is an amenable number.

18736889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18736889 is an equidigital number, since it uses as much as digits as its factorization.

18736889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 18736889 is about 4328.6128262990. The cubic root of 18736889 is about 265.6027055614.

The spelling of 18736889 in words is "eighteen million, seven hundred thirty-six thousand, eight hundred eighty-nine".