2118955 has 4 divisors (see below), whose sum is σ = 2542752. Its totient is φ = 1695160.

The previous prime is 2118923. The next prime is 2118959. The reversal of 2118955 is 5598112.

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

It is not a de Polignac number, because 2118955 - 2⁵ = 2118923 is a prime.

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 a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2118959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211891 + ... + 211900.

It is an arithmetic number, because the mean of its divisors is an integer number (635688).

2^2118955 is an apocalyptic number.

2118955 is a deficient number, since it is larger than the sum of its proper divisors (423797).

2118955 is an equidigital number, since it uses as much as digits as its factorization.

2118955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423796.

The product of its digits is 3600, while the sum is 31.

The square root of 2118955 is about 1455.6630791498. The cubic root of 2118955 is about 128.4420547537.

The spelling of 2118955 in words is "two million, one hundred eighteen thousand, nine hundred fifty-five".