40305917 has 4 divisors (see below), whose sum is σ = 41066460. Its totient is φ = 39545376.

The previous prime is 40305901. The next prime is 40305943. The reversal of 40305917 is 71950304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23174596 + 17131321 = 4814^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 40305917 - 2⁴ = 40305901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40305917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40305217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380192 + ... + 380297.

It is an arithmetic number, because the mean of its divisors is an integer number (10266615).

Almost surely, 2^40305917 is an apocalyptic number.

It is an amenable number.

40305917 is a deficient number, since it is larger than the sum of its proper divisors (760543).

40305917 is an equidigital number, since it uses as much as digits as its factorization.

40305917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760542.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 40305917 is about 6348.6941176907. The cubic root of 40305917 is about 342.8648272997.

The spelling of 40305917 in words is "forty million, three hundred five thousand, nine hundred seventeen".