2811988 has 12 divisors (see below), whose sum is σ = 4943092. Its totient is φ = 1399680.

The previous prime is 2811983. The next prime is 2811989. The reversal of 2811988 is 8891182.

It can be written as a sum of positive squares in 2 ways, for example, as 2598544 + 213444 = 1612^2 + 462^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2811983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495 + ... + 2422.

2^2811988 is an apocalyptic number.

It is an amenable number.

2811988 is a deficient number, since it is larger than the sum of its proper divisors (2131104).

2811988 is a wasteful number, since it uses less digits than its factorization.

2811988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162 (or 3160 counting only the distinct ones).

The product of its digits is 9216, while the sum is 37.

The square root of 2811988 is about 1676.8983272697. The cubic root of 2811988 is about 141.1468382933.

The spelling of 2811988 in words is "two million, eight hundred eleven thousand, nine hundred eighty-eight".