720383 has 4 divisors (see below), whose sum is σ = 751728. Its totient is φ = 689040.

The previous prime is 720373. The next prime is 720397. The reversal of 720383 is 383027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 383027 = 17 ⋅22531.

It is a cyclic number.

It is not a de Polignac number, because 720383 - 2⁴ = 720367 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 31321 = 720383 / (7 + 2 + 0 + 3 + 8 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15638 + ... + 15683.

It is an arithmetic number, because the mean of its divisors is an integer number (187932).

2⁷²⁰³⁸³ is an apocalyptic number.

720383 is a deficient number, since it is larger than the sum of its proper divisors (31345).

720383 is a wasteful number, since it uses less digits than its factorization.

720383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31344.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 720383 is about 848.7537923332. The cubic root of 720383 is about 89.6439845031.

The spelling of 720383 in words is "seven hundred twenty thousand, three hundred eighty-three".