729989 has 8 divisors (see below), whose sum is σ = 792792. Its totient is φ = 668160.

The previous prime is 729979. The next prime is 729991. The reversal of 729989 is 989927.

It can be written as a sum of positive squares in 4 ways, for example, as 21025 + 708964 = 145^2 + 842^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729919) 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, 2909 + ... + 3149.

It is an arithmetic number, because the mean of its divisors is an integer number (99099).

2⁷²⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

729989 is a deficient number, since it is larger than the sum of its proper divisors (62803).

729989 is a wasteful number, since it uses less digits than its factorization.

729989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487.

The product of its digits is 81648, while the sum is 44.

The square root of 729989 is about 854.3939372444. The cubic root of 729989 is about 90.0406811973.

The spelling of 729989 in words is "seven hundred twenty-nine thousand, nine hundred eighty-nine".