2188861986 has 32 divisors (see below), whose sum is σ = 4410806400. Its totient is φ = 724121216.

The previous prime is 2188861967. The next prime is 2188861991. The reversal of 2188861986 is 6891688812.

It is a super-2 number, since 2×2188861986² = 9582233587511728392, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 857440 + ... + 859988.

It is an arithmetic number, because the mean of its divisors is an integer number (137837700).

Almost surely, 2^2188861986 is an apocalyptic number.

2188861986 is an abundant number, since it is smaller than the sum of its proper divisors (2221944414).

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

2188861986 is a wasteful number, since it uses less digits than its factorization.

2188861986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578.

The product of its digits is 2654208, while the sum is 57.

The square root of 2188861986 is about 46785.2753117901. The cubic root of 2188861986 is about 1298.3928830639.

The spelling of 2188861986 in words is "two billion, one hundred eighty-eight million, eight hundred sixty-one thousand, nine hundred eighty-six".