2187864189 has 20 divisors (see below), whose sum is σ = 3735190624. Its totient is φ = 1250207784.

The previous prime is 2187864149. The next prime is 2187864191. The reversal of 2187864189 is 9814687812.

2187864189 is a `hidden beast` number, since 218 + 7 + 8 + 6 + 418 + 9 = 666.

It is not a de Polignac number, because 2187864189 - 2¹³ = 2187855997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187864149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1928767 + ... + 1929900.

Almost surely, 2^2187864189 is an apocalyptic number.

It is an amenable number.

2187864189 is a deficient number, since it is larger than the sum of its proper divisors (1547326435).

2187864189 is an equidigital number, since it uses as much as digits as its factorization.

2187864189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858686 (or 3858677 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 2187864189 is about 46774.6105168178. The cubic root of 2187864189 is about 1298.1955614361.

The spelling of 2187864189 in words is "two billion, one hundred eighty-seven million, eight hundred sixty-four thousand, one hundred eighty-nine".