40036729 has 2 divisors, whose sum is σ = 40036730. Its totient is φ = 40036728.

The previous prime is 40036723. The next prime is 40036811. The reversal of 40036729 is 92763004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 19316025 = 4552^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 40036729 - 2⁵ = 40036697 is a prime.

It is equal to p_2435746 and since 40036729 and 2435746 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40036729.

It is not a weakly prime, because it can be changed into another prime (40036723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20018364 + 20018365.

It is an arithmetic number, because the mean of its divisors is an integer number (20018365).

Almost surely, 2^40036729 is an apocalyptic number.

It is an amenable number.

40036729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40036729 is an equidigital number, since it uses as much as digits as its factorization.

40036729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 40036729 is about 6327.4583364887. The cubic root of 40036729 is about 342.0998334905.

The spelling of 40036729 in words is "forty million, thirty-six thousand, seven hundred twenty-nine".