40808917 has 4 divisors (see below), whose sum is σ = 40821696. Its totient is φ = 40796140.

The previous prime is 40808897. The next prime is 40808947. The reversal of 40808917 is 71980804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40808917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40808947) 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, 3042 + ... + 9532.

It is an arithmetic number, because the mean of its divisors is an integer number (10205424).

Almost surely, 2^40808917 is an apocalyptic number.

It is an amenable number.

40808917 is a deficient number, since it is larger than the sum of its proper divisors (12779).

40808917 is an equidigital number, since it uses as much as digits as its factorization.

40808917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12778.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 40808917 is about 6388.1857361852. The cubic root of 40808917 is about 344.2852021184.

The spelling of 40808917 in words is "forty million, eight hundred eight thousand, nine hundred seventeen".