1989220180 has 24 divisors (see below), whose sum is σ = 4194015840. Its totient is φ = 792516000.

The previous prime is 1989220169. The next prime is 1989220217. The reversal of 1989220180 is 810229891.

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, 193110 + ... + 203149.

It is an arithmetic number, because the mean of its divisors is an integer number (174750660).

Almost surely, 2^1989220180 is an apocalyptic number.

1989220180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989220180 is an abundant number, since it is smaller than the sum of its proper divisors (2204795660).

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

1989220180 is a wasteful number, since it uses less digits than its factorization.

1989220180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396519 (or 396517 counting only the distinct ones).

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

The square root of 1989220180 is about 44600.6746585744. The cubic root of 1989220180 is about 1257.6533504144.

The spelling of 1989220180 in words is "one billion, nine hundred eighty-nine million, two hundred twenty thousand, one hundred eighty".