2187911040 has 128 divisors (see below), whose sum is σ = 7970296320. Its totient is φ = 500090880.

The previous prime is 2187911017. The next prime is 2187911057. The reversal of 2187911040 is 401197812.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 2187910992 and 2187911010.

It is a congruent number.

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, 67956 + ... + 94835.

It is an arithmetic number, because the mean of its divisors is an integer number (62267940).

Almost surely, 2^2187911040 is an apocalyptic number.

2187911040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187911040 is an abundant number, since it is smaller than the sum of its proper divisors (5782385280).

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

2187911040 is a wasteful number, since it uses less digits than its factorization.

2187911040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162820 (or 162808 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 2187911040 is about 46775.1113307066. Note that the first 3 decimals coincide. The cubic root of 2187911040 is about 1298.2048279049.

The spelling of 2187911040 in words is "two billion, one hundred eighty-seven million, nine hundred eleven thousand, forty".