189185220 has 288 divisors, whose sum is σ = 698600448. Its totient is φ = 42083712.

The previous prime is 189185203. The next prime is 189185233. The reversal of 189185220 is 22581981.

189185220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2279299 + ... + 2279381.

It is an arithmetic number, because the mean of its divisors is an integer number (2425696).

Almost surely, 2^189185220 is an apocalyptic number.

189185220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189185220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349300224).

189185220 is an abundant number, since it is smaller than the sum of its proper divisors (509415228).

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

189185220 is a wasteful number, since it uses less digits than its factorization.

189185220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 189185220 is about 13754.4618215327. The cubic root of 189185220 is about 574.0667608816.

The spelling of 189185220 in words is "one hundred eighty-nine million, one hundred eighty-five thousand, two hundred twenty".