3681220 has 24 divisors (see below), whose sum is σ = 7809984. Its totient is φ = 1457376.

The previous prime is 3681217. The next prime is 3681239. The reversal of 3681220 is 221863.

It is a junction number, because it is equal to n+sod(n) for n = 3681191 and 3681200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167 + ... + 2953.

It is an arithmetic number, because the mean of its divisors is an integer number (325416).

Almost surely, 2^3681220 is an apocalyptic number.

It is an amenable number.

3681220 is an abundant number, since it is smaller than the sum of its proper divisors (4128764).

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

3681220 is a wasteful number, since it uses less digits than its factorization.

3681220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1897 counting only the distinct ones).

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

The square root of 3681220 is about 1918.6505674562. The cubic root of 3681220 is about 154.4059117892.

The spelling of 3681220 in words is "three million, six hundred eighty-one thousand, two hundred twenty".