3815220 has 24 divisors (see below), whose sum is σ = 10682784. Its totient is φ = 1017376.

The previous prime is 3815209. The next prime is 3815221. The reversal of 3815220 is 225183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3815221) 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, 31734 + ... + 31853.

It is an arithmetic number, because the mean of its divisors is an integer number (445116).

Almost surely, 2^3815220 is an apocalyptic number.

3815220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3815220 is an abundant number, since it is smaller than the sum of its proper divisors (6867564).

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

3815220 is a wasteful number, since it uses less digits than its factorization.

3815220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63599 (or 63597 counting only the distinct ones).

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

The square root of 3815220 is about 1953.2588154159. The cubic root of 3815220 is about 156.2571367407.

The spelling of 3815220 in words is "three million, eight hundred fifteen thousand, two hundred twenty".