2185543994 has 16 divisors (see below), whose sum is σ = 3396388320. Its totient is φ = 1053526320.

The previous prime is 2185543993. The next prime is 2185544029. The reversal of 2185543994 is 4993455812.

It is not an unprimeable number, because it can be changed into a prime (2185543993) 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 7 ways as a sum of consecutive naturals, for example, 12029 + ... + 67199.

It is an arithmetic number, because the mean of its divisors is an integer number (212274270).

Almost surely, 2^2185543994 is an apocalyptic number.

2185543994 is a deficient number, since it is larger than the sum of its proper divisors (1210844326).

2185543994 is a wasteful number, since it uses less digits than its factorization.

2185543994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55885.

The product of its digits is 1555200, while the sum is 50.

The square root of 2185543994 is about 46749.8020744473. The cubic root of 2185543994 is about 1297.7364939060.

The spelling of 2185543994 in words is "two billion, one hundred eighty-five million, five hundred forty-three thousand, nine hundred ninety-four".