4491220 has 48 divisors (see below), whose sum is σ = 10160640. Its totient is φ = 1662336.

The previous prime is 4491217. The next prime is 4491241. The reversal of 4491220 is 221944.

It is a junction number, because it is equal to n+sod(n) for n = 4491191 and 4491200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20029 + ... + 20251.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

Almost surely, 2^4491220 is an apocalyptic number.

4491220 is the 1060-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4491220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5080320).

4491220 is an abundant number, since it is smaller than the sum of its proper divisors (5669420).

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

4491220 is a wasteful number, since it uses less digits than its factorization.

4491220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 4491220 is about 2119.2498672880. The cubic root of 4491220 is about 164.9889187538.

The spelling of 4491220 in words is "four million, four hundred ninety-one thousand, two hundred twenty".