2118813 has 8 divisors (see below), whose sum is σ = 2852928. Its totient is φ = 1398624.

The previous prime is 2118811. The next prime is 2118833. The reversal of 2118813 is 3188112.

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

It is not a de Polignac number, because 2118813 - 2¹ = 2118811 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118811) 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, 3120 + ... + 3737.

It is an arithmetic number, because the mean of its divisors is an integer number (356616).

2^2118813 is an apocalyptic number.

It is an amenable number.

2118813 is a deficient number, since it is larger than the sum of its proper divisors (734115).

2118813 is a wasteful number, since it uses less digits than its factorization.

2118813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963.

The product of its digits is 384, while the sum is 24.

The square root of 2118813 is about 1455.6143033098. The cubic root of 2118813 is about 128.4391855439.

The spelling of 2118813 in words is "two million, one hundred eighteen thousand, eight hundred thirteen".