2191288 has 32 divisors (see below), whose sum is σ = 4610160. Its totient is φ = 967680.

The previous prime is 2191261. The next prime is 2191291. The reversal of 2191288 is 8821912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2920 + ... + 3592.

2^2191288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2305080).

2191288 is an abundant number, since it is smaller than the sum of its proper divisors (2418872).

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

2191288 is a wasteful number, since it uses less digits than its factorization.

2191288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727 (or 723 counting only the distinct ones).

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

The square root of 2191288 is about 1480.2999696008. The cubic root of 2191288 is about 129.8872394992.

The spelling of 2191288 in words is "two million, one hundred ninety-one thousand, two hundred eighty-eight".