2118928 has 20 divisors (see below), whose sum is σ = 4692160. Its totient is φ = 908064.

The previous prime is 2118923. The next prime is 2118959. The reversal of 2118928 is 8298112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2118928.

It is not an unprimeable number, because it can be changed into a prime (2118923) 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, 9348 + ... + 9571.

It is an arithmetic number, because the mean of its divisors is an integer number (234608).

2^2118928 is an apocalyptic number.

2118928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2118928 is an abundant number, since it is smaller than the sum of its proper divisors (2573232).

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

2118928 is a wasteful number, since it uses less digits than its factorization.

2118928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18934 (or 18928 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 2118928 is about 1455.6538049962. The cubic root of 2118928 is about 128.4415092096.

The spelling of 2118928 in words is "two million, one hundred eighteen thousand, nine hundred twenty-eight".