189391086 has 48 divisors (see below), whose sum is σ = 423852000. Its totient is φ = 61072704.

The previous prime is 189391073. The next prime is 189391087. The reversal of 189391086 is 680193981.

189391086 is a `hidden beast` number, since 189 + 391 + 0 + 86 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189391087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131820 + ... + 133248.

It is an arithmetic number, because the mean of its divisors is an integer number (8830250).

Almost surely, 2^189391086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189391086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211926000).

189391086 is an abundant number, since it is smaller than the sum of its proper divisors (234460914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189391086 is a wasteful number, since it uses less digits than its factorization.

189391086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1670 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 189391086 is about 13761.9433947390. The cubic root of 189391086 is about 574.2749131300.

The spelling of 189391086 in words is "one hundred eighty-nine million, three hundred ninety-one thousand, eighty-six".