720923 has 8 divisors (see below), whose sum is σ = 829920. Its totient is φ = 613440.

The previous prime is 720913. The next prime is 720931. The reversal of 720923 is 329027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720923 - 2¹² = 716827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720913) 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 7 ways as a sum of consecutive naturals, for example, 983 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (103740).

2⁷²⁰⁹²³ is an apocalyptic number.

720923 is a deficient number, since it is larger than the sum of its proper divisors (108997).

720923 is a wasteful number, since it uses less digits than its factorization.

720923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

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

The square root of 720923 is about 849.0718461944. The cubic root of 720923 is about 89.6663779897. Note that the first 3 decimals are identical.

The spelling of 720923 in words is "seven hundred twenty thousand, nine hundred twenty-three".