140705729 has 2 divisors, whose sum is σ = 140705730. Its totient is φ = 140705728.

The previous prime is 140705717. The next prime is 140705731. The reversal of 140705729 is 927507041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140375104 + 330625 = 11848^2 + 575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140705729 is a prime.

Together with 140705731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140705779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70352864 + 70352865.

It is an arithmetic number, because the mean of its divisors is an integer number (70352865).

Almost surely, 2^140705729 is an apocalyptic number.

It is an amenable number.

140705729 is a deficient number, since it is larger than the sum of its proper divisors (1).

140705729 is an equidigital number, since it uses as much as digits as its factorization.

140705729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 140705729 is about 11861.9445707692. The cubic root of 140705729 is about 520.1204467045.

The spelling of 140705729 in words is "one hundred forty million, seven hundred five thousand, seven hundred twenty-nine".