729698909 has 4 divisors (see below), whose sum is σ = 730065216. Its totient is φ = 729332604.

The previous prime is 729698891. The next prime is 729698911. The reversal of 729698909 is 909896927.

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.

It is a cyclic number.

It is not a de Polignac number, because 729698909 - 2²⁰ = 728650333 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729698009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180149 + ... + 184154.

It is an arithmetic number, because the mean of its divisors is an integer number (182516304).

Almost surely, 2^729698909 is an apocalyptic number.

It is an amenable number.

729698909 is a deficient number, since it is larger than the sum of its proper divisors (366307).

729698909 is a wasteful number, since it uses less digits than its factorization.

729698909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366306.

The product of its (nonzero) digits is 4408992, while the sum is 59.

The square root of 729698909 is about 27012.9396586155. The cubic root of 729698909 is about 900.2875250064.

The spelling of 729698909 in words is "seven hundred twenty-nine million, six hundred ninety-eight thousand, nine hundred nine".