189321985 has 16 divisors (see below), whose sum is σ = 239607360. Its totient is φ = 143208000.

The previous prime is 189321983. The next prime is 189322009. The reversal of 189321985 is 589123981.

It is not a de Polignac number, because 189321985 - 2¹ = 189321983 is a prime.

Its product of digits (155520) is a multiple of the sum of its prime divisors (3888).

It is not an unprimeable number, because it can be changed into a prime (189321983) 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 15 ways as a sum of consecutive naturals, for example, 56610 + ... + 59860.

It is an arithmetic number, because the mean of its divisors is an integer number (14975460).

Almost surely, 2^189321985 is an apocalyptic number.

It is an amenable number.

189321985 is a deficient number, since it is larger than the sum of its proper divisors (50285375).

189321985 is a wasteful number, since it uses less digits than its factorization.

189321985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888.

The product of its digits is 155520, while the sum is 46.

The square root of 189321985 is about 13759.4325827775. The cubic root of 189321985 is about 574.2050615532.

The spelling of 189321985 in words is "one hundred eighty-nine million, three hundred twenty-one thousand, nine hundred eighty-five".