720396 has 18 divisors (see below), whose sum is σ = 1821092. Its totient is φ = 240120.

The previous prime is 720373. The next prime is 720397. The reversal of 720396 is 693027.

It is a tau number, because it is divible by the number of its divisors (18).

720396 is a modest number, since divided by 396 gives 72 as remainder.

It is not an unprimeable number, because it can be changed into a prime (720397) by changing a digit.

720396 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9970 + ... + 10041.

2⁷²⁰³⁹⁶ is an apocalyptic number.

It is an amenable number.

720396 is an abundant number, since it is smaller than the sum of its proper divisors (1100696).

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

720396 is a wasteful number, since it uses less digits than its factorization.

720396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20021 (or 20016 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 720396 is about 848.7614505855. The cubic root of 720396 is about 89.6445237370.

It can be divided in two parts, 72039 and 6, that multiplied together give a palindrome (432234).

The spelling of 720396 in words is "seven hundred twenty thousand, three hundred ninety-six".