3920720 has 20 divisors (see below), whose sum is σ = 9115860. Its totient is φ = 1568256.

The previous prime is 3920689. The next prime is 3920729. The reversal of 3920720 is 270293.

It can be written as a sum of positive squares in 2 ways, for example, as 446224 + 3474496 = 668^2 + 1864^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3920729) 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, 24425 + ... + 24584.

It is an arithmetic number, because the mean of its divisors is an integer number (455793).

Almost surely, 2^3920720 is an apocalyptic number.

It is an amenable number.

3920720 is an abundant number, since it is smaller than the sum of its proper divisors (5195140).

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

3920720 is a wasteful number, since it uses less digits than its factorization.

3920720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49022 (or 49016 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 3920720 is about 1980.0808064319. The cubic root of 3920720 is about 157.6843562244.

It can be divided in two parts, 3920 and 720, that multiplied together give a square (2822400 = 1680²).

The spelling of 3920720 in words is "three million, nine hundred twenty thousand, seven hundred twenty".