2180938890 has 64 divisors (see below), whose sum is σ = 5881994496. Its totient is φ = 513503232.

The previous prime is 2180938849. The next prime is 2180938897. The reversal of 2180938890 is 988390812.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2180938897) 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 31 ways as a sum of consecutive naturals, for example, 112599 + ... + 130538.

It is an arithmetic number, because the mean of its divisors is an integer number (91906164).

Almost surely, 2^2180938890 is an apocalyptic number.

2180938890 is an abundant number, since it is smaller than the sum of its proper divisors (3701055606).

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

2180938890 is a wasteful number, since it uses less digits than its factorization.

2180938890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243183.

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 2180938890 is about 46700.5234446039. The cubic root of 2180938890 is about 1296.8243771521.

The spelling of 2180938890 in words is "two billion, one hundred eighty million, nine hundred thirty-eight thousand, eight hundred ninety".