40317729 has 16 divisors (see below), whose sum is σ = 54712320. Its totient is φ = 26404560.

The previous prime is 40317713. The next prime is 40317733. The reversal of 40317729 is 92771304.

It is not a de Polignac number, because 40317729 - 2⁴ = 40317713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40317729.

It is not an unprimeable number, because it can be changed into a prime (40317749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73434 + ... + 73980.

It is an arithmetic number, because the mean of its divisors is an integer number (3419520).

Almost surely, 2^40317729 is an apocalyptic number.

It is an amenable number.

40317729 is a deficient number, since it is larger than the sum of its proper divisors (14394591).

40317729 is a wasteful number, since it uses less digits than its factorization.

40317729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 40317729 is about 6349.6243195956. The cubic root of 40317729 is about 342.8983172029.

The spelling of 40317729 in words is "forty million, three hundred seventeen thousand, seven hundred twenty-nine".