2218172 has 18 divisors (see below), whose sum is σ = 4267704. Its totient is φ = 1008040.

The previous prime is 2218171. The next prime is 2218199. The reversal of 2218172 is 2718122.

2218172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1808 + ... + 2775.

2^2218172 is an apocalyptic number.

2218172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2218172 is a deficient number, since it is larger than the sum of its proper divisors (2049532).

2218172 is a wasteful number, since it uses less digits than its factorization.

2218172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609 (or 4596 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 2218172 is about 1489.3528796091. The cubic root of 2218172 is about 130.4162594050.

The spelling of 2218172 in words is "two million, two hundred eighteen thousand, one hundred seventy-two".