2118865 has 8 divisors (see below), whose sum is σ = 2905920. Its totient is φ = 1452912.

The previous prime is 2118841. The next prime is 2118871. The reversal of 2118865 is 5688112.

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 2118865 - 2⁵ = 2118833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30235 + ... + 30304.

It is an arithmetic number, because the mean of its divisors is an integer number (363240).

2^2118865 is an apocalyptic number.

It is an amenable number.

2118865 is a deficient number, since it is larger than the sum of its proper divisors (787055).

2118865 is an equidigital number, since it uses as much as digits as its factorization.

2118865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60551.

The product of its digits is 3840, while the sum is 31.

The square root of 2118865 is about 1455.6321650747. The cubic root of 2118865 is about 128.4402362553.

The spelling of 2118865 in words is "two million, one hundred eighteen thousand, eight hundred sixty-five".