16999989 has 8 divisors (see below), whose sum is σ = 22686240. Its totient is φ = 11323536.

The previous prime is 16999963. The next prime is 16999999. The reversal of 16999989 is 98999961.

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

It is not a de Polignac number, because 16999989 - 2⁸ = 16999733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16999999) 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, 4122 + ... + 7140.

It is an arithmetic number, because the mean of its divisors is an integer number (2835780).

Almost surely, 2^16999989 is an apocalyptic number.

It is an amenable number.

16999989 is a deficient number, since it is larger than the sum of its proper divisors (5686251).

16999989 is a wasteful number, since it uses less digits than its factorization.

16999989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4899.

The product of its digits is 2834352, while the sum is 60.

The square root of 16999989 is about 4123.1042916715. The cubic root of 16999989 is about 257.1281036068.

The spelling of 16999989 in words is "sixteen million, nine hundred ninety-nine thousand, nine hundred eighty-nine".