3928220 has 24 divisors (see below), whose sum is σ = 8391600. Its totient is φ = 1544192.

The previous prime is 3928189. The next prime is 3928229. The reversal of 3928220 is 228293.

It is a self number, because there is not a number n which added to its sum of digits gives 3928220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3928229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485 + ... + 2844.

It is an arithmetic number, because the mean of its divisors is an integer number (349650).

Almost surely, 2^3928220 is an apocalyptic number.

It is an amenable number.

3928220 is an abundant number, since it is smaller than the sum of its proper divisors (4463380).

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

3928220 is a wasteful number, since it uses less digits than its factorization.

3928220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397 (or 3395 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 3928220 is about 1981.9737637012. The cubic root of 3928220 is about 157.7848377159.

The spelling of 3928220 in words is "three million, nine hundred twenty-eight thousand, two hundred twenty".