16989869 has 4 divisors (see below), whose sum is σ = 18296796. Its totient is φ = 15682944.

The previous prime is 16989827. The next prime is 16989883. The reversal of 16989869 is 96898961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1857769 + 15132100 = 1363^2 + 3890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16989869 is a prime.

It is a super-2 number, since 2×16989869² = 577311297274322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16989569) 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 in 3 ways as a sum of consecutive naturals, for example, 653444 + ... + 653469.

It is an arithmetic number, because the mean of its divisors is an integer number (4574199).

Almost surely, 2^16989869 is an apocalyptic number.

It is an amenable number.

16989869 is a deficient number, since it is larger than the sum of its proper divisors (1306927).

16989869 is a wasteful number, since it uses less digits than its factorization.

16989869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306926.

The product of its digits is 1679616, while the sum is 56.

The square root of 16989869 is about 4121.8768783165. The cubic root of 16989869 is about 257.0770711635.

The spelling of 16989869 in words is "sixteen million, nine hundred eighty-nine thousand, eight hundred sixty-nine".