34639729 has 2 divisors, whose sum is σ = 34639730. Its totient is φ = 34639728.

The previous prime is 34639697. The next prime is 34639751. The reversal of 34639729 is 92793643.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33039504 + 1600225 = 5748^2 + 1265^2 .

It is an emirp because it is prime and its reverse (92793643) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34639729 - 2⁵ = 34639697 is a prime.

It is not a weakly prime, because it can be changed into another prime (34639769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17319864 + 17319865.

It is an arithmetic number, because the mean of its divisors is an integer number (17319865).

Almost surely, 2^34639729 is an apocalyptic number.

It is an amenable number.

34639729 is a deficient number, since it is larger than the sum of its proper divisors (1).

34639729 is an equidigital number, since it uses as much as digits as its factorization.

34639729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 43.

The square root of 34639729 is about 5885.5525653926. The cubic root of 34639729 is about 325.9804051855.

The spelling of 34639729 in words is "thirty-four million, six hundred thirty-nine thousand, seven hundred twenty-nine".