16864989 has 8 divisors (see below), whose sum is σ = 23670240. Its totient is φ = 10651536.

The previous prime is 16864943. The next prime is 16864993. The reversal of 16864989 is 98946861.

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 16864989 - 2⁸ = 16864733 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (16864909) 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, 147882 + ... + 147995.

It is an arithmetic number, because the mean of its divisors is an integer number (2958780).

Almost surely, 2^16864989 is an apocalyptic number.

16864989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16864989 is a deficient number, since it is larger than the sum of its proper divisors (6805251).

16864989 is a wasteful number, since it uses less digits than its factorization.

16864989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295899.

The product of its digits is 746496, while the sum is 51.

The square root of 16864989 is about 4106.7005004018. The cubic root of 16864989 is about 256.4456602816.

The spelling of 16864989 in words is "sixteen million, eight hundred sixty-four thousand, nine hundred eighty-nine".