40729973 has 4 divisors (see below), whose sum is σ = 40743180. Its totient is φ = 40716768.

The previous prime is 40729961. The next prime is 40729979. The reversal of 40729973 is 37992704.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 40424164 + 305809 = 6358^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 40729973 - 2⁴ = 40729957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40729973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40729979) 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 in 3 ways as a sum of consecutive naturals, for example, 761 + ... + 9057.

It is an arithmetic number, because the mean of its divisors is an integer number (10185795).

Almost surely, 2^40729973 is an apocalyptic number.

It is an amenable number.

40729973 is a deficient number, since it is larger than the sum of its proper divisors (13207).

40729973 is an equidigital number, since it uses as much as digits as its factorization.

40729973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13206.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 40729973 is about 6382.0038389208. The cubic root of 40729973 is about 344.0630546259.

The spelling of 40729973 in words is "forty million, seven hundred twenty-nine thousand, nine hundred seventy-three".