729705039421 has 2 divisors, whose sum is σ = 729705039422. Its totient is φ = 729705039420.

The previous prime is 729705039419. The next prime is 729705039463. The reversal of 729705039421 is 124930507927.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 719339763321 + 10365276100 = 848139^2 + 101810^2 .

It is a cyclic number.

It is not a de Polignac number, because 729705039421 - 2¹ = 729705039419 is a prime.

Together with 729705039419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729705039491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364852519710 + 364852519711.

It is an arithmetic number, because the mean of its divisors is an integer number (364852519711).

Almost surely, 2^729705039421 is an apocalyptic number.

It is an amenable number.

729705039421 is a deficient number, since it is larger than the sum of its proper divisors (1).

729705039421 is an equidigital number, since it uses as much as digits as its factorization.

729705039421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 729705039421 in words is "seven hundred twenty-nine billion, seven hundred five million, thirty-nine thousand, four hundred twenty-one".