2128518 has 40 divisors (see below), whose sum is σ = 5453712. Its totient is φ = 607824.

The previous prime is 2128501. The next prime is 2128531. The reversal of 2128518 is 8158212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2128491 and 2128500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 196 + ... + 2072.

2^2128518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2128518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2726856).

2128518 is an abundant number, since it is smaller than the sum of its proper divisors (3325194).

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

2128518 is a wasteful number, since it uses less digits than its factorization.

2128518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898 (or 1889 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 2128518 is about 1458.9441387524. The cubic root of 2128518 is about 128.6349876221.

The spelling of 2128518 in words is "two million, one hundred twenty-eight thousand, five hundred eighteen".