2189971980 has 144 divisors (see below), whose sum is σ = 7716631104. Its totient is φ = 492341760.

The previous prime is 2189971961. The next prime is 2189972017. The reversal of 2189971980 is 891799812.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62614 + ... + 91106.

It is an arithmetic number, because the mean of its divisors is an integer number (53587716).

Almost surely, 2^2189971980 is an apocalyptic number.

2189971980 is a gapful number since it is divisible by the number (20) 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 2189971980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3858315552).

2189971980 is an abundant number, since it is smaller than the sum of its proper divisors (5526659124).

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

2189971980 is a wasteful number, since it uses less digits than its factorization.

2189971980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28576 (or 28571 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 2189971980 is about 46797.1364508556. The cubic root of 2189971980 is about 1298.6123220190.

It can be divided in two parts, 2189 and 971980, that added together give a square (974169 = 987²).

The spelling of 2189971980 in words is "two billion, one hundred eighty-nine million, nine hundred seventy-one thousand, nine hundred eighty".