189919 has 4 divisors (see below), whose sum is σ = 191160. Its totient is φ = 188680.

The previous prime is 189913. The next prime is 189929. The reversal of 189919 is 919981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919981 = 463 ⋅1987.

It is a cyclic number.

It is not a de Polignac number, because 189919 - 2⁵ = 189887 is a prime.

It is a super-2 number, since 2×189919² = 72138453122, which contains 22 as substring.

It is a Duffinian number.

189919 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189913) 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, 352 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (47790).

2¹⁸⁹⁹¹⁹ is an apocalyptic number.

189919 is a deficient number, since it is larger than the sum of its proper divisors (1241).

189919 is a wasteful number, since it uses less digits than its factorization.

189919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its digits is 5832, while the sum is 37.

The square root of 189919 is about 435.7969710771. The cubic root of 189919 is about 57.4808001429.

The spelling of 189919 in words is "one hundred eighty-nine thousand, nine hundred nineteen".