2118665 has 8 divisors (see below), whose sum is σ = 2550528. Its totient is φ = 1689520.

The previous prime is 2118661. The next prime is 2118667. The reversal of 2118665 is 5668112.

It is a happy number.

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

It is not a de Polignac number, because 2118665 - 2² = 2118661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2118661) 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, 2024 + ... + 2886.

It is an arithmetic number, because the mean of its divisors is an integer number (318816).

2^2118665 is an apocalyptic number.

It is an amenable number.

2118665 is a deficient number, since it is larger than the sum of its proper divisors (431863).

2118665 is an equidigital number, since it uses as much as digits as its factorization.

2118665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359.

The product of its digits is 2880, while the sum is 29.

The square root of 2118665 is about 1455.5634647792. The cubic root of 2118665 is about 128.4361949635.

The spelling of 2118665 in words is "two million, one hundred eighteen thousand, six hundred sixty-five".