189918220 has 24 divisors (see below), whose sum is σ = 422289504. Its totient is φ = 71498496.

The previous prime is 189918217. The next prime is 189918241. The reversal of 189918220 is 22819981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278952 + ... + 279631.

It is an arithmetic number, because the mean of its divisors is an integer number (17595396).

Almost surely, 2^189918220 is an apocalyptic number.

189918220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189918220 is an abundant number, since it is smaller than the sum of its proper divisors (232371284).

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

189918220 is a wasteful number, since it uses less digits than its factorization.

189918220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558609 (or 558607 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 189918220 is about 13781.0819604268. The cubic root of 189918220 is about 574.8072145133.

The spelling of 189918220 in words is "one hundred eighty-nine million, nine hundred eighteen thousand, two hundred twenty".