2211988 has 12 divisors (see below), whose sum is σ = 3911572. Its totient is φ = 1094400.

The previous prime is 2211983. The next prime is 2211997. The reversal of 2211988 is 8891122.

It is a happy number.

2211988 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1468944 + 743044 = 1212^2 + 862^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2463 + ... + 3238.

2^2211988 is an apocalyptic number.

It is an amenable number.

2211988 is a deficient number, since it is larger than the sum of its proper divisors (1699584).

2211988 is a wasteful number, since it uses less digits than its factorization.

2211988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5802 (or 5800 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 2211988 is about 1487.2753611890. The cubic root of 2211988 is about 130.2949515923.

It can be divided in two parts, 221 and 1988, that added together give a square (2209 = 47²).

The spelling of 2211988 in words is "two million, two hundred eleven thousand, nine hundred eighty-eight".