2011993 has 8 divisors (see below), whose sum is σ = 2128896. Its totient is φ = 1898400.

The previous prime is 2011987. The next prime is 2012009. The reversal of 2011993 is 3991102.

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

It is a cyclic number.

It is not a de Polignac number, because 2011993 - 2¹³ = 2003801 is a prime.

It is an Ulam number.

It is a Duffinian number.

2011993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2011903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480 + ... + 2062.

It is an arithmetic number, because the mean of its divisors is an integer number (266112).

2^2011993 is an apocalyptic number.

It is an amenable number.

2011993 is a deficient number, since it is larger than the sum of its proper divisors (116903).

2011993 is a wasteful number, since it uses less digits than its factorization.

2011993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 2011993 is about 1418.4473906353. The cubic root of 2011993 is about 126.2434404983.

The spelling of 2011993 in words is "two million, eleven thousand, nine hundred ninety-three".