720939 has 8 divisors (see below), whose sum is σ = 967680. Its totient is φ = 477416.

The previous prime is 720931. The next prime is 720943. The reversal of 720939 is 939027.

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 720939 - 2³ = 720931 is a prime.

It is an Ulam number.

720939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (720931) 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, 219 + ... + 1220.

It is an arithmetic number, because the mean of its divisors is an integer number (120960).

2⁷²⁰⁹³⁹ is an apocalyptic number.

720939 is a deficient number, since it is larger than the sum of its proper divisors (246741).

720939 is a wasteful number, since it uses less digits than its factorization.

720939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 720939 is about 849.0812681952. The cubic root of 720939 is about 89.6670413298.

The spelling of 720939 in words is "seven hundred twenty thousand, nine hundred thirty-nine".