720929 has 4 divisors (see below), whose sum is σ = 786480. Its totient is φ = 655380.

The previous prime is 720913. The next prime is 720931. The reversal of 720929 is 929027.

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: 929027 = 11 ⋅84457.

It is not a de Polignac number, because 720929 - 2⁴ = 720913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32759 + ... + 32780.

It is an arithmetic number, because the mean of its divisors is an integer number (196620).

2⁷²⁰⁹²⁹ is an apocalyptic number.

It is an amenable number.

720929 is a deficient number, since it is larger than the sum of its proper divisors (65551).

720929 is a wasteful number, since it uses less digits than its factorization.

720929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65550.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 720929 is about 849.0753794570. The cubic root of 720929 is about 89.6666267434. Note that the first 4 decimals are identical.

The spelling of 720929 in words is "seven hundred twenty thousand, nine hundred twenty-nine".