189986 has 4 divisors (see below), whose sum is σ = 284982. Its totient is φ = 94992.

The previous prime is 189983. The next prime is 189989. The reversal of 189986 is 689981.

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

It is an interprime number because it is at equal distance from previous prime (189983) and next prime (189989).

It can be written as a sum of positive squares in only one way, i.e., 185761 + 4225 = 431^2 + 65^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (189983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47495 + ... + 47498.

2¹⁸⁹⁹⁸⁶ is an apocalyptic number.

189986 is a deficient number, since it is larger than the sum of its proper divisors (94996).

189986 is an equidigital number, since it uses as much as digits as its factorization.

189986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94995.

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

The square root of 189986 is about 435.8738349569. The cubic root of 189986 is about 57.4875587450.

The spelling of 189986 in words is "one hundred eighty-nine thousand, nine hundred eighty-six".