2118172 has 36 divisors (see below), whose sum is σ = 4395384. Its totient is φ = 890400.

The previous prime is 2118169. The next prime is 2118173. The reversal of 2118172 is 2718112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19743 + ... + 19849.

It is an arithmetic number, because the mean of its divisors is an integer number (122094).

2^2118172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2197692).

2118172 is an abundant number, since it is smaller than the sum of its proper divisors (2277212).

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

2118172 is a wasteful number, since it uses less digits than its factorization.

2118172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 217 counting only the distinct ones).

The product of its digits is 224, while the sum is 22.

The square root of 2118172 is about 1455.3941047015. The cubic root of 2118172 is about 128.4262320928.

The spelling of 2118172 in words is "two million, one hundred eighteen thousand, one hundred seventy-two".