720392 has 16 divisors (see below), whose sum is σ = 1430460. Its totient is φ = 338944.

The previous prime is 720373. The next prime is 720397. The reversal of 720392 is 293027.

720392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 649636 + 70756 = 806^2 + 266^2 .

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720392.

It is not an unprimeable number, because it can be changed into a prime (720397) 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, 2513 + ... + 2784.

2⁷²⁰³⁹² is an apocalyptic number.

It is an amenable number.

720392 is a deficient number, since it is larger than the sum of its proper divisors (710068).

720392 is a wasteful number, since it uses less digits than its factorization.

720392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320 (or 5316 counting only the distinct ones).

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

The square root of 720392 is about 848.7590942075. The cubic root of 720392 is about 89.6443578195.

The spelling of 720392 in words is "seven hundred twenty thousand, three hundred ninety-two".