189869 has 4 divisors (see below), whose sum is σ = 191100. Its totient is φ = 188640.

The previous prime is 189859. The next prime is 189877. The reversal of 189869 is 968981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75625 + 114244 = 275^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 189869 - 2⁴ = 189853 is a prime.

It is a super-2 number, since 2×189869² = 72100474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189859) 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, 344 + ... + 705.

It is an arithmetic number, because the mean of its divisors is an integer number (47775).

2¹⁸⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

189869 is a deficient number, since it is larger than the sum of its proper divisors (1231).

189869 is a wasteful number, since it uses less digits than its factorization.

189869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230.

The product of its digits is 31104, while the sum is 41.

The square root of 189869 is about 435.7396011381. The cubic root of 189869 is about 57.4757553743.

The spelling of 189869 in words is "one hundred eighty-nine thousand, eight hundred sixty-nine".