2109918 has 8 divisors (see below), whose sum is σ = 4219848. Its totient is φ = 703304.

The previous prime is 2109911. The next prime is 2109941. The reversal of 2109918 is 8199012.

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

2109918 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109911) 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, 175821 + ... + 175832.

It is an arithmetic number, because the mean of its divisors is an integer number (527481).

2^2109918 is an apocalyptic number.

2109918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2109918 is a wasteful number, since it uses less digits than its factorization.

2109918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351658.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2109918 is about 1452.5556787951. Note that the first 3 decimals coincide. The cubic root of 2109918 is about 128.2591997018.

The spelling of 2109918 in words is "two million, one hundred nine thousand, nine hundred eighteen".