2139820680 has 128 divisors (see below), whose sum is σ = 6658329600. Its totient is φ = 549491712.

The previous prime is 2139820633. The next prime is 2139820723. The reversal of 2139820680 is 860289312.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2111854 + ... + 2112866.

It is an arithmetic number, because the mean of its divisors is an integer number (52018200).

Almost surely, 2^2139820680 is an apocalyptic number.

2139820680 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 2139820680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3329164800).

2139820680 is an abundant number, since it is smaller than the sum of its proper divisors (4518508920).

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

2139820680 is a wasteful number, since it uses less digits than its factorization.

2139820680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 2139820680 is about 46258.1958143635. The cubic root of 2139820680 is about 1288.6227474112.

The spelling of 2139820680 in words is "two billion, one hundred thirty-nine million, eight hundred twenty thousand, six hundred eighty".