2118838 has 4 divisors (see below), whose sum is σ = 3178260. Its totient is φ = 1059418.

The previous prime is 2118833. The next prime is 2118841. The reversal of 2118838 is 8388112.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 529708 + ... + 529711.

It is an arithmetic number, because the mean of its divisors is an integer number (794565).

2^2118838 is an apocalyptic number.

2118838 is a deficient number, since it is larger than the sum of its proper divisors (1059422).

2118838 is a wasteful number, since it uses less digits than its factorization.

2118838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059421.

The product of its digits is 3072, while the sum is 31.

The square root of 2118838 is about 1455.6228907241. The cubic root of 2118838 is about 128.4396906958.

The spelling of 2118838 in words is "two million, one hundred eighteen thousand, eight hundred thirty-eight".