3531220 has 48 divisors (see below), whose sum is σ = 9249408. Its totient is φ = 1100160.

The previous prime is 3531211. The next prime is 3531233. The reversal of 3531220 is 221353.

3531220 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

3531220 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 3531194 and 3531203.

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, 394 + ... + 2686.

It is an arithmetic number, because the mean of its divisors is an integer number (192696).

Almost surely, 2^3531220 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 3531220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4624704).

3531220 is an abundant number, since it is smaller than the sum of its proper divisors (5718188).

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

3531220 is a wasteful number, since it uses less digits than its factorization.

3531220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2318 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 3531220 is about 1879.1540649984. The cubic root of 3531220 is about 152.2795524864.

Adding to 3531220 its reverse (221353), we get a palindrome (3752573).

The spelling of 3531220 in words is "three million, five hundred thirty-one thousand, two hundred twenty".