3621220 has 12 divisors (see below), whose sum is σ = 7604604. Its totient is φ = 1448480.

The previous prime is 3621217. The next prime is 3621223. The reversal of 3621220 is 221263.

It is an interprime number because it is at equal distance from previous prime (3621217) and next prime (3621223).

It can be written as a sum of positive squares in 2 ways, for example, as 2166784 + 1454436 = 1472^2 + 1206^2 .

It is a super-2 number, since 2×3621220² = 26226468576800, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3621194 and 3621203.

It is not an unprimeable number, because it can be changed into a prime (3621223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90511 + ... + 90550.

It is an arithmetic number, because the mean of its divisors is an integer number (633717).

Almost surely, 2^3621220 is an apocalyptic number.

It is an amenable number.

3621220 is an abundant number, since it is smaller than the sum of its proper divisors (3983384).

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

3621220 is a wasteful number, since it uses less digits than its factorization.

3621220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181070 (or 181068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 3621220 is about 1902.9503409180. The cubic root of 3621220 is about 153.5624279667.

Adding to 3621220 its reverse (221263), we get a palindrome (3842483).

The spelling of 3621220 in words is "three million, six hundred twenty-one thousand, two hundred twenty".