2191894 has 4 divisors (see below), whose sum is σ = 3287844. Its totient is φ = 1095946.

The previous prime is 2191883. The next prime is 2191949. The reversal of 2191894 is 4981912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547972 + ... + 547975.

It is an arithmetic number, because the mean of its divisors is an integer number (821961).

2^2191894 is an apocalyptic number.

2191894 is a deficient number, since it is larger than the sum of its proper divisors (1095950).

2191894 is a wasteful number, since it uses less digits than its factorization.

2191894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095949.

The product of its digits is 5184, while the sum is 34.

The square root of 2191894 is about 1480.5046436942. The cubic root of 2191894 is about 129.8992118206.

The spelling of 2191894 in words is "two million, one hundred ninety-one thousand, eight hundred ninety-four".