16819989 has 8 divisors (see below), whose sum is σ = 22478400. Its totient is φ = 11187456.

The previous prime is 16819981. The next prime is 16819991. The reversal of 16819989 is 98991861.

It is a happy number.

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

It is not a de Polignac number, because 16819989 - 2³ = 16819981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16819981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4897 + ... + 7590.

It is an arithmetic number, because the mean of its divisors is an integer number (2809800).

Almost surely, 2^16819989 is an apocalyptic number.

It is an amenable number.

16819989 is a deficient number, since it is larger than the sum of its proper divisors (5658411).

16819989 is a wasteful number, since it uses less digits than its factorization.

16819989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12939.

The product of its digits is 279936, while the sum is 51.

The square root of 16819989 is about 4101.2179898172. The cubic root of 16819989 is about 256.2173701066.

The spelling of 16819989 in words is "sixteen million, eight hundred nineteen thousand, nine hundred eighty-nine".