16389889 has 2 divisors, whose sum is σ = 16389890. Its totient is φ = 16389888.

The previous prime is 16389883. The next prime is 16389899. The reversal of 16389889 is 98898361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 2640625 = 3708^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 16389889 - 2¹¹ = 16387841 is a prime.

It is a super-2 number, since 2×16389889² = 537256922864642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16389883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8194944 + 8194945.

It is an arithmetic number, because the mean of its divisors is an integer number (8194945).

Almost surely, 2^16389889 is an apocalyptic number.

It is an amenable number.

16389889 is a deficient number, since it is larger than the sum of its proper divisors (1).

16389889 is an equidigital number, since it uses as much as digits as its factorization.

16389889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 52.

The square root of 16389889 is about 4048.4427870479. The cubic root of 16389889 is about 254.0145950239.

The spelling of 16389889 in words is "sixteen million, three hundred eighty-nine thousand, eight hundred eighty-nine".