16989717 has 4 divisors (see below), whose sum is σ = 22652960. Its totient is φ = 11326476.

The previous prime is 16989691. The next prime is 16989719. The reversal of 16989717 is 71798961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16989717 - 2⁸ = 16989461 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 (16989719) 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 3 ways as a sum of consecutive naturals, for example, 2831617 + ... + 2831622.

It is an arithmetic number, because the mean of its divisors is an integer number (5663240).

Almost surely, 2^16989717 is an apocalyptic number.

It is an amenable number.

16989717 is a deficient number, since it is larger than the sum of its proper divisors (5663243).

16989717 is an equidigital number, since it uses as much as digits as its factorization.

16989717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663242.

The product of its digits is 190512, while the sum is 48.

The square root of 16989717 is about 4121.8584400729. The cubic root of 16989717 is about 257.0763045138.

The spelling of 16989717 in words is "sixteen million, nine hundred eighty-nine thousand, seven hundred seventeen".