16216989 has 8 divisors (see below), whose sum is σ = 22207200. Its totient is φ = 10519056.

The previous prime is 16216979. The next prime is 16217009. The reversal of 16216989 is 98961261.

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

It is not a de Polignac number, because 16216989 - 2⁴ = 16216973 is a prime.

It is a super-2 number, since 2×16216989² = 525981464452242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16216989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16216939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72939 + ... + 73160.

It is an arithmetic number, because the mean of its divisors is an integer number (2775900).

Almost surely, 2^16216989 is an apocalyptic number.

It is an amenable number.

16216989 is a deficient number, since it is larger than the sum of its proper divisors (5990211).

16216989 is a wasteful number, since it uses less digits than its factorization.

16216989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146139.

The product of its digits is 46656, while the sum is 42.

The square root of 16216989 is about 4027.0322819665. The cubic root of 16216989 is about 253.1182197849.

It can be divided in two parts, 16216 and 989, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 16216989 in words is "sixteen million, two hundred sixteen thousand, nine hundred eighty-nine".