2139820218 has 48 divisors (see below), whose sum is σ = 4670265600. Its totient is φ = 708066720.

The previous prime is 2139820211. The next prime is 2139820253. The reversal of 2139820218 is 8120289312.

It is not an unprimeable number, because it can be changed into a prime (2139820211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1737663 + ... + 1738893.

It is an arithmetic number, because the mean of its divisors is an integer number (97297200).

Almost surely, 2^2139820218 is an apocalyptic number.

2139820218 is an abundant number, since it is smaller than the sum of its proper divisors (2530445382).

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

2139820218 is a wasteful number, since it uses less digits than its factorization.

2139820218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 2139820218 is about 46258.1908206536. The cubic root of 2139820218 is about 1288.6226546707.

It can be divided in two parts, 21398 and 20218, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 2139820218 in words is "two billion, one hundred thirty-nine million, eight hundred twenty thousand, two hundred eighteen".