2193891 has 8 divisors (see below), whose sum is σ = 3343104. Its totient is φ = 1253640.

The previous prime is 2193889. The next prime is 2193929. The reversal of 2193891 is 1983912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2193891 - 2¹ = 2193889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2193881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52215 + ... + 52256.

It is an arithmetic number, because the mean of its divisors is an integer number (417888).

2^2193891 is an apocalyptic number.

2193891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2193891 is a deficient number, since it is larger than the sum of its proper divisors (1149213).

2193891 is a wasteful number, since it uses less digits than its factorization.

2193891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104481.

The product of its digits is 3888, while the sum is 33.

The square root of 2193891 is about 1481.1789223453. The cubic root of 2193891 is about 129.9386495526.

The spelling of 2193891 in words is "two million, one hundred ninety-three thousand, eight hundred ninety-one".