2172218 has 8 divisors (see below), whose sum is σ = 3292212. Its totient is φ = 1074816.

The previous prime is 2172211. The next prime is 2172227. The reversal of 2172218 is 8122712.

It can be written as a sum of positive squares in 2 ways, for example, as 2111209 + 61009 = 1453^2 + 247^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2172193 and 2172202.

It is not an unprimeable number, because it can be changed into a prime (2172211) 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, 5405 + ... + 5792.

2^2172218 is an apocalyptic number.

2172218 is a deficient number, since it is larger than the sum of its proper divisors (1119994).

2172218 is a wasteful number, since it uses less digits than its factorization.

2172218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11296.

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

The square root of 2172218 is about 1473.8446322459. The cubic root of 2172218 is about 129.5093536870.

The spelling of 2172218 in words is "two million, one hundred seventy-two thousand, two hundred eighteen".