40070729 has 2 divisors, whose sum is σ = 40070730. Its totient is φ = 40070728.

The previous prime is 40070713. The next prime is 40070731. The reversal of 40070729 is 92707004.

40070729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38440000 + 1630729 = 6200^2 + 1277^2 .

It is a cyclic number.

It is not a de Polignac number, because 40070729 - 2⁴ = 40070713 is a prime.

Together with 40070731, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 7.

It is not a weakly prime, because it can be changed into another prime (40070629) 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, 20035364 + 20035365.

It is an arithmetic number, because the mean of its divisors is an integer number (20035365).

Almost surely, 2^40070729 is an apocalyptic number.

It is an amenable number.

40070729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40070729 is an equidigital number, since it uses as much as digits as its factorization.

40070729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 40070729 is about 6330.1444691255. The cubic root of 40070729 is about 342.1966454566.

The spelling of 40070729 in words is "forty million, seventy thousand, seven hundred twenty-nine".