3928720 has 20 divisors (see below), whose sum is σ = 9134460. Its totient is φ = 1571456.

The previous prime is 3928709. The next prime is 3928721. The reversal of 3928720 is 278293.

It can be written as a sum of positive squares in 2 ways, for example, as 984064 + 2944656 = 992^2 + 1716^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (3928721) 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, 24475 + ... + 24634.

It is an arithmetic number, because the mean of its divisors is an integer number (456723).

Almost surely, 2^3928720 is an apocalyptic number.

It is an amenable number.

3928720 is an abundant number, since it is smaller than the sum of its proper divisors (5205740).

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

3928720 is a wasteful number, since it uses less digits than its factorization.

3928720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49122 (or 49116 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 3928720 is about 1982.0998965743. The cubic root of 3928720 is about 157.7915319330.

The spelling of 3928720 in words is "three million, nine hundred twenty-eight thousand, seven hundred twenty".