4721220 has 96 divisors (see below), whose sum is σ = 16800000. Its totient is φ = 1078272.

The previous prime is 4721201. The next prime is 4721221. The reversal of 4721220 is 221274.

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 = 4721193 and 4721202.

It is not an unprimeable number, because it can be changed into a prime (4721221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3156 + ... + 4404.

It is an arithmetic number, because the mean of its divisors is an integer number (175000).

Almost surely, 2^4721220 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 4721220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8400000).

4721220 is an abundant number, since it is smaller than the sum of its proper divisors (12078780).

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

4721220 is a wasteful number, since it uses less digits than its factorization.

4721220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1266 counting only the distinct ones).

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

The square root of 4721220 is about 2172.8368553575. The cubic root of 4721220 is about 167.7585818165.

Adding to 4721220 its reverse (221274), we get a palindrome (4942494).

The spelling of 4721220 in words is "four million, seven hundred twenty-one thousand, two hundred twenty".