723989 has 8 divisors (see below), whose sum is σ = 841920. Its totient is φ = 609696.

The previous prime is 723977. The next prime is 723997. The reversal of 723989 is 989327.

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 723989 - 2⁴ = 723973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464 + ... + 1289.

It is an arithmetic number, because the mean of its divisors is an integer number (105240).

2⁷²³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

723989 is a deficient number, since it is larger than the sum of its proper divisors (117931).

723989 is a wasteful number, since it uses less digits than its factorization.

723989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819.

The product of its digits is 27216, while the sum is 38.

The square root of 723989 is about 850.8754315410. The cubic root of 723989 is about 89.7933117044.

The spelling of 723989 in words is "seven hundred twenty-three thousand, nine hundred eighty-nine".