729940909 has 4 divisors (see below), whose sum is σ = 732781404. Its totient is φ = 727100416.

The previous prime is 729940901. The next prime is 729940969. The reversal of 729940909 is 909049927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909049927 = 19 ⋅47844733.

It can be written as a sum of positive squares in 2 ways, for example, as 514291684 + 215649225 = 22678^2 + 14685^2 .

It is a cyclic number.

It is not a de Polignac number, because 729940909 - 2³ = 729940901 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 (729940901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1419862 + ... + 1420375.

It is an arithmetic number, because the mean of its divisors is an integer number (183195351).

Almost surely, 2^729940909 is an apocalyptic number.

It is an amenable number.

729940909 is a deficient number, since it is larger than the sum of its proper divisors (2840495).

729940909 is a wasteful number, since it uses less digits than its factorization.

729940909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840494.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 729940909 is about 27017.4186220668. The cubic root of 729940909 is about 900.3870388825.

The spelling of 729940909 in words is "seven hundred twenty-nine million, nine hundred forty thousand, nine hundred nine".