40729309 has 2 divisors, whose sum is σ = 40729310. Its totient is φ = 40729308.

The previous prime is 40729291. The next prime is 40729313. The reversal of 40729309 is 90392704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39879225 + 850084 = 6315^2 + 922^2 .

It is a cyclic number.

It is not a de Polignac number, because 40729309 - 2⁷ = 40729181 is a prime.

It is a super-2 number, since 2×40729309² = 3317753223234962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40729379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20364654 + 20364655.

It is an arithmetic number, because the mean of its divisors is an integer number (20364655).

Almost surely, 2^40729309 is an apocalyptic number.

It is an amenable number.

40729309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40729309 is an equidigital number, since it uses as much as digits as its factorization.

40729309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 40729309 is about 6381.9518174302. The cubic root of 40729309 is about 344.0611849209.

The spelling of 40729309 in words is "forty million, seven hundred twenty-nine thousand, three hundred nine".