2011988 has 18 divisors (see below), whose sum is σ = 3871098. Its totient is φ = 914320.

The previous prime is 2011987. The next prime is 2012009. The reversal of 2011988 is 8891102.

It can be written as a sum of positive squares in only one way, i.e., 1684804 + 327184 = 1298^2 + 572^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2011988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1595 + ... + 2562.

It is an arithmetic number, because the mean of its divisors is an integer number (215061).

2^2011988 is an apocalyptic number.

It is an amenable number.

2011988 is a deficient number, since it is larger than the sum of its proper divisors (1859110).

2011988 is a wasteful number, since it uses less digits than its factorization.

2011988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183 (or 4170 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 2011988 is about 1418.4456281437. The cubic root of 2011988 is about 126.2433359225.

The spelling of 2011988 in words is "two million, eleven thousand, nine hundred eighty-eight".