17989221 has 4 divisors (see below), whose sum is σ = 23985632. Its totient is φ = 11992812.

The previous prime is 17989177. The next prime is 17989253. The reversal of 17989221 is 12298971.

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 17989221 - 2¹⁰ = 17988197 is a prime.

It is a super-2 number, since 2×17989221² = 647224144373682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17989221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17989271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2998201 + ... + 2998206.

It is an arithmetic number, because the mean of its divisors is an integer number (5996408).

Almost surely, 2^17989221 is an apocalyptic number.

It is an amenable number.

17989221 is a deficient number, since it is larger than the sum of its proper divisors (5996411).

17989221 is an equidigital number, since it uses as much as digits as its factorization.

17989221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996410.

The product of its digits is 18144, while the sum is 39.

The square root of 17989221 is about 4241.3701795528. The cubic root of 17989221 is about 262.0218160650.

The spelling of 17989221 in words is "seventeen million, nine hundred eighty-nine thousand, two hundred twenty-one".