2109993 has 4 divisors (see below), whose sum is σ = 2813328. Its totient is φ = 1406660.

The previous prime is 2109979. The next prime is 2110001. The reversal of 2109993 is 3999012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2109993 - 2¹² = 2105897 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2109973) 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, 351663 + ... + 351668.

It is an arithmetic number, because the mean of its divisors is an integer number (703332).

2^2109993 is an apocalyptic number.

It is an amenable number.

2109993 is a deficient number, since it is larger than the sum of its proper divisors (703335).

2109993 is an equidigital number, since it uses as much as digits as its factorization.

2109993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703334.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 2109993 is about 1452.5814951320. The cubic root of 2109993 is about 128.2607194016.

The spelling of 2109993 in words is "two million, one hundred nine thousand, nine hundred ninety-three".