2187985384 has 16 divisors (see below), whose sum is σ = 4418047620. Its totient is φ = 1009839360.

The previous prime is 2187985381. The next prime is 2187985399. The reversal of 2187985384 is 4835897812.

It can be written as a sum of positive squares in 2 ways, for example, as 2059162884 + 128822500 = 45378^2 + 11350^2 .

It is not an unprimeable number, because it can be changed into a prime (2187985381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10519057 + ... + 10519264.

Almost surely, 2^2187985384 is an apocalyptic number.

It is an amenable number.

2187985384 is an abundant number, since it is smaller than the sum of its proper divisors (2230062236).

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

2187985384 is a wasteful number, since it uses less digits than its factorization.

2187985384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21038340 (or 21038336 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 55.

The square root of 2187985384 is about 46775.9060200869. The cubic root of 2187985384 is about 1298.2195318310.

The spelling of 2187985384 in words is "two billion, one hundred eighty-seven million, nine hundred eighty-five thousand, three hundred eighty-four".