189984889 has 4 divisors (see below), whose sum is σ = 190181520. Its totient is φ = 189788260.

The previous prime is 189984871. The next prime is 189984901. The reversal of 189984889 is 988489981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 988489981 = 89 ⋅11106629.

It is a cyclic number.

It is not a de Polignac number, because 189984889 - 2¹⁷ = 189853817 is a prime.

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 189984889.

It is not an unprimeable number, because it can be changed into a prime (189984859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96859 + ... + 98800.

It is an arithmetic number, because the mean of its divisors is an integer number (47545380).

Almost surely, 2^189984889 is an apocalyptic number.

It is an amenable number.

189984889 is a deficient number, since it is larger than the sum of its proper divisors (196631).

189984889 is an equidigital number, since it uses as much as digits as its factorization.

189984889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196630.

The product of its digits is 11943936, while the sum is 64.

The square root of 189984889 is about 13783.5006076105. The cubic root of 189984889 is about 574.8744668617.

The spelling of 189984889 in words is "one hundred eighty-nine million, nine hundred eighty-four thousand, eight hundred eighty-nine".