3904820 has 12 divisors (see below), whose sum is σ = 8200164. Its totient is φ = 1561920.

The previous prime is 3904801. The next prime is 3904829. The reversal of 3904820 is 284093.

It can be written as a sum of positive squares in 2 ways, for example, as 1008016 + 2896804 = 1004^2 + 1702^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3904820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3904829) 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, 97601 + ... + 97640.

It is an arithmetic number, because the mean of its divisors is an integer number (683347).

Almost surely, 2^3904820 is an apocalyptic number.

It is an amenable number.

3904820 is an abundant number, since it is smaller than the sum of its proper divisors (4295344).

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

3904820 is a wasteful number, since it uses less digits than its factorization.

3904820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195250 (or 195248 counting only the distinct ones).

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

The square root of 3904820 is about 1976.0617399262. The cubic root of 3904820 is about 157.4709108955.

The spelling of 3904820 in words is "three million, nine hundred four thousand, eight hundred twenty".