16819889 has 2 divisors, whose sum is σ = 16819890. Its totient is φ = 16819888.

The previous prime is 16819871. The next prime is 16819909. The reversal of 16819889 is 98891861.

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., 11833600 + 4986289 = 3440^2 + 2233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16819889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16819289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8409944 + 8409945.

It is an arithmetic number, because the mean of its divisors is an integer number (8409945).

Almost surely, 2^16819889 is an apocalyptic number.

It is an amenable number.

16819889 is a deficient number, since it is larger than the sum of its proper divisors (1).

16819889 is an equidigital number, since it uses as much as digits as its factorization.

16819889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 50.

The square root of 16819889 is about 4101.2057982988. The cubic root of 16819889 is about 256.2168623419.

The spelling of 16819889 in words is "sixteen million, eight hundred nineteen thousand, eight hundred eighty-nine".