2179189940 has 24 divisors (see below), whose sum is σ = 4583938632. Its totient is φ = 870220800.

The previous prime is 2179189939. The next prime is 2179189951. The reversal of 2179189940 is 499819712.

It can be written as a sum of positive squares in 4 ways, for example, as 1143251344 + 1035938596 = 33812^2 + 32186^2 .

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, 78629 + ... + 102668.

It is an arithmetic number, because the mean of its divisors is an integer number (190997443).

Almost surely, 2^2179189940 is an apocalyptic number.

2179189940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2179189940 is an abundant number, since it is smaller than the sum of its proper divisors (2404748692).

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

2179189940 is a wasteful number, since it uses less digits than its factorization.

2179189940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181907 (or 181905 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 2179189940 is about 46681.7945242040. The cubic root of 2179189940 is about 1296.4776323698.

The spelling of 2179189940 in words is "two billion, one hundred seventy-nine million, one hundred eighty-nine thousand, nine hundred forty".