720973 has 4 divisors (see below), whose sum is σ = 786528. Its totient is φ = 655420.

The previous prime is 720971. The next prime is 720983. The reversal of 720973 is 379027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379027 = 11 ⋅34457.

It is a cyclic number.

It is not a de Polignac number, because 720973 - 2¹ = 720971 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32761 + ... + 32782.

It is an arithmetic number, because the mean of its divisors is an integer number (196632).

2⁷²⁰⁹⁷³ is an apocalyptic number.

It is an amenable number.

720973 is a deficient number, since it is larger than the sum of its proper divisors (65555).

720973 is a wasteful number, since it uses less digits than its factorization.

720973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65554.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 720973 is about 849.1012895998. The cubic root of 720973 is about 89.6684508949.

The spelling of 720973 in words is "seven hundred twenty thousand, nine hundred seventy-three".