16989287 has 8 divisors (see below), whose sum is σ = 20438400. Its totient is φ = 13795704.

The previous prime is 16989283. The next prime is 16989317. The reversal of 16989287 is 78298961.

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

It is a cyclic number.

It is not a de Polignac number, because 16989287 - 2² = 16989283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16989283) 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, 63737 + ... + 64002.

It is an arithmetic number, because the mean of its divisors is an integer number (2554800).

Almost surely, 2^16989287 is an apocalyptic number.

16989287 is a deficient number, since it is larger than the sum of its proper divisors (3449113).

16989287 is a wasteful number, since it uses less digits than its factorization.

16989287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127765.

The product of its digits is 435456, while the sum is 50.

The square root of 16989287 is about 4121.8062788054. The cubic root of 16989287 is about 257.0741356776.

The spelling of 16989287 in words is "sixteen million, nine hundred eighty-nine thousand, two hundred eighty-seven".