3503220 has 96 divisors (see below), whose sum is σ = 11827200. Its totient is φ = 756864.

The previous prime is 3503191. The next prime is 3503221. The reversal of 3503220 is 223053.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 3503220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3503221) 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, 7761 + ... + 8199.

It is an arithmetic number, because the mean of its divisors is an integer number (123200).

Almost surely, 2^3503220 is an apocalyptic number.

3503220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3503220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5913600).

3503220 is an abundant number, since it is smaller than the sum of its proper divisors (8323980).

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

3503220 is a wasteful number, since it uses less digits than its factorization.

3503220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 15.

The square root of 3503220 is about 1871.6890767433. The cubic root of 3503220 is about 151.8759953533.

Adding to 3503220 its reverse (223053), we get a palindrome (3726273).

It can be divided in two parts, 350 and 3220, that added together give a triangular number (3570 = T₈₄).

The spelling of 3503220 in words is "three million, five hundred three thousand, two hundred twenty".