2191284 has 18 divisors (see below), whose sum is σ = 5539170. Its totient is φ = 730416.

The previous prime is 2191261. The next prime is 2191291. The reversal of 2191284 is 4821912.

It can be written as a sum of positive squares in only one way, i.e., 2039184 + 152100 = 1428^2 + 390^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30399 + ... + 30470.

2^2191284 is an apocalyptic number.

It is an amenable number.

2191284 is an abundant number, since it is smaller than the sum of its proper divisors (3347886).

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

2191284 is a wasteful number, since it uses less digits than its factorization.

2191284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60879 (or 60874 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 2191284 is about 1480.2986185226. The cubic root of 2191284 is about 129.8871604667.

The spelling of 2191284 in words is "two million, one hundred ninety-one thousand, two hundred eighty-four".