4172220 has 72 divisors (see below), whose sum is σ = 13636896. Its totient is φ = 1026432.

The previous prime is 4172183. The next prime is 4172239. The reversal of 4172220 is 222714.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 4172193 and 4172202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1449 + ... + 3231.

Almost surely, 2^4172220 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 4172220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6818448).

4172220 is an abundant number, since it is smaller than the sum of its proper divisors (9464676).

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

4172220 is a wasteful number, since it uses less digits than its factorization.

4172220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 4172220 is about 2042.6012826785. The cubic root of 4172220 is about 160.9863548226.

Adding to 4172220 its reverse (222714), we get a palindrome (4394934).

The spelling of 4172220 in words is "four million, one hundred seventy-two thousand, two hundred twenty".