729734421 has 8 divisors (see below), whose sum is σ = 1047823840. Its totient is φ = 449067312.

The previous prime is 729734419. The next prime is 729734459. The reversal of 729734421 is 124437927.

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

It is not a de Polignac number, because 729734421 - 2¹ = 729734419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 18711139 = 729734421 / (7 + 2 + 9 + 7 + 3 + 4 + 4 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 729734421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729734471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9355531 + ... + 9355608.

It is an arithmetic number, because the mean of its divisors is an integer number (130977980).

Almost surely, 2^729734421 is an apocalyptic number.

It is an amenable number.

729734421 is a deficient number, since it is larger than the sum of its proper divisors (318089419).

729734421 is a wasteful number, since it uses less digits than its factorization.

729734421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18711155.

The product of its digits is 84672, while the sum is 39.

The square root of 729734421 is about 27013.5969652322. The cubic root of 729734421 is about 900.3021294282.

The spelling of 729734421 in words is "seven hundred twenty-nine million, seven hundred thirty-four thousand, four hundred twenty-one".