3655220 has 24 divisors (see below), whose sum is σ = 8080800. Its totient is φ = 1384992.

The previous prime is 3655219. The next prime is 3655231. The reversal of 3655220 is 225563.

It is a happy number.

It is a congruent number.

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, 4430 + ... + 5189.

It is an arithmetic number, because the mean of its divisors is an integer number (336700).

Almost surely, 2^3655220 is an apocalyptic number.

It is an amenable number.

3655220 is an abundant number, since it is smaller than the sum of its proper divisors (4425580).

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

3655220 is a wasteful number, since it uses less digits than its factorization.

3655220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9647 (or 9645 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 3655220 is about 1911.8629658006. The cubic root of 3655220 is about 154.0415359935.

The spelling of 3655220 in words is "three million, six hundred fifty-five thousand, two hundred twenty".