189423220 has 72 divisors (see below), whose sum is σ = 465048864. Its totient is φ = 64620864.

The previous prime is 189423203. The next prime is 189423233. The reversal of 189423220 is 22324981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 276999 + ... + 277681.

It is an arithmetic number, because the mean of its divisors is an integer number (6459012).

Almost surely, 2^189423220 is an apocalyptic number.

189423220 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 189423220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232524432).

189423220 is an abundant number, since it is smaller than the sum of its proper divisors (275625644).

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

189423220 is a wasteful number, since it uses less digits than its factorization.

189423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 189423220 is about 13763.1108402134. The cubic root of 189423220 is about 574.3073903827.

The spelling of 189423220 in words is "one hundred eighty-nine million, four hundred twenty-three thousand, two hundred twenty".