3581220 has 48 divisors (see below), whose sum is σ = 10620288. Its totient is φ = 898560.

The previous prime is 3581219. The next prime is 3581251. The reversal of 3581220 is 221853.

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, 736 + ... + 2775.

It is an arithmetic number, because the mean of its divisors is an integer number (221256).

Almost surely, 2^3581220 is an apocalyptic number.

3581220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3581220 is an abundant number, since it is smaller than the sum of its proper divisors (7039068).

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

3581220 is a wasteful number, since it uses less digits than its factorization.

3581220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540 (or 3538 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 3581220 is about 1892.4111603983. The cubic root of 3581220 is about 152.9949163162.

The spelling of 3581220 in words is "three million, five hundred eighty-one thousand, two hundred twenty".