2118505 has 8 divisors (see below), whose sum is σ = 2550024. Its totient is φ = 1689600.

The previous prime is 2118503. The next prime is 2118517. The reversal of 2118505 is 5058112.

It can be written as a sum of positive squares in 4 ways, for example, as 906304 + 1212201 = 952^2 + 1101^2 .

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

It is not a de Polignac number, because 2118505 - 2¹ = 2118503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2118503) 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, 2875 + ... + 3535.

It is an arithmetic number, because the mean of its divisors is an integer number (318753).

2^2118505 is an apocalyptic number.

It is an amenable number.

2118505 is a deficient number, since it is larger than the sum of its proper divisors (431519).

2118505 is an equidigital number, since it uses as much as digits as its factorization.

2118505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2118505 is about 1455.5085022081. The cubic root of 2118505 is about 128.4329617469.

The spelling of 2118505 in words is "two million, one hundred eighteen thousand, five hundred five".