673406729 has 2 divisors, whose sum is σ = 673406730. Its totient is φ = 673406728.

The previous prime is 673406681. The next prime is 673406731. The reversal of 673406729 is 927604376.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 573506704 + 99900025 = 23948^2 + 9995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673406729 is a prime.

Together with 673406731, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 673406729.

It is not a weakly prime, because it can be changed into another prime (673496729) 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 as a sum of consecutive naturals, namely, 336703364 + 336703365.

It is an arithmetic number, because the mean of its divisors is an integer number (336703365).

Almost surely, 2^673406729 is an apocalyptic number.

It is an amenable number.

673406729 is a deficient number, since it is larger than the sum of its proper divisors (1).

673406729 is an equidigital number, since it uses as much as digits as its factorization.

673406729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 673406729 is about 25950.0814834944. The cubic root of 673406729 is about 876.5145921322.

The spelling of 673406729 in words is "six hundred seventy-three million, four hundred six thousand, seven hundred twenty-nine".