3813220 has 24 divisors (see below), whose sum is σ = 8225784. Its totient is φ = 1483776.

The previous prime is 3813211. The next prime is 3813221. The reversal of 3813220 is 223183.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1272384 + 2540836 = 1128^2 + 1594^2 .

It is not an unprimeable number, because it can be changed into a prime (3813221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1837 + ... + 3316.

It is an arithmetic number, because the mean of its divisors is an integer number (342741).

Almost surely, 2^3813220 is an apocalyptic number.

It is an amenable number.

3813220 is an abundant number, since it is smaller than the sum of its proper divisors (4412564).

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

3813220 is a wasteful number, since it uses less digits than its factorization.

3813220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199 (or 5197 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 3813220 is about 1952.7467833798. The cubic root of 3813220 is about 156.2298277958.

The spelling of 3813220 in words is "three million, eight hundred thirteen thousand, two hundred twenty".