189251220 has 24 divisors (see below), whose sum is σ = 529903584. Its totient is φ = 50466976.

The previous prime is 189251197. The next prime is 189251233. The reversal of 189251220 is 22152981.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577034 + ... + 1577153.

It is an arithmetic number, because the mean of its divisors is an integer number (22079316).

Almost surely, 2^189251220 is an apocalyptic number.

189251220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189251220 is an abundant number, since it is smaller than the sum of its proper divisors (340652364).

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

189251220 is a wasteful number, since it uses less digits than its factorization.

189251220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154199 (or 3154197 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 189251220 is about 13756.8608337804. The cubic root of 189251220 is about 574.1335102840.

The spelling of 189251220 in words is "one hundred eighty-nine million, two hundred fifty-one thousand, two hundred twenty".