16868189 has 8 divisors (see below), whose sum is σ = 18657240. Its totient is φ = 15149376.

The previous prime is 16868167. The next prime is 16868197. The reversal of 16868189 is 98186861.

It can be written as a sum of positive squares in 4 ways, for example, as 8076964 + 8791225 = 2842^2 + 2965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16868189 - 2²⁰ = 15819613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16868119) 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 in 7 ways as a sum of consecutive naturals, for example, 17054 + ... + 18015.

It is an arithmetic number, because the mean of its divisors is an integer number (2332155).

Almost surely, 2^16868189 is an apocalyptic number.

It is an amenable number.

16868189 is a deficient number, since it is larger than the sum of its proper divisors (1789051).

16868189 is a wasteful number, since it uses less digits than its factorization.

16868189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35119.

The product of its digits is 165888, while the sum is 47.

The square root of 16868189 is about 4107.0900891020. The cubic root of 16868189 is about 256.4618787765.

The spelling of 16868189 in words is "sixteen million, eight hundred sixty-eight thousand, one hundred eighty-nine".