209814189 has 8 divisors (see below), whose sum is σ = 301271712. Its totient is φ = 129116400.

The previous prime is 209814173. The next prime is 209814203. The reversal of 209814189 is 981418902.

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

It is not a de Polignac number, because 209814189 - 2⁴ = 209814173 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 209814189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209814109) 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 7 ways as a sum of consecutive naturals, for example, 2689887 + ... + 2689964.

It is an arithmetic number, because the mean of its divisors is an integer number (37658964).

Almost surely, 2^209814189 is an apocalyptic number.

It is an amenable number.

209814189 is a deficient number, since it is larger than the sum of its proper divisors (91457523).

209814189 is a wasteful number, since it uses less digits than its factorization.

209814189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379867.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 209814189 is about 14484.9642388236. The cubic root of 209814189 is about 594.2168346437.

The spelling of 209814189 in words is "two hundred nine million, eight hundred fourteen thousand, one hundred eighty-nine".