3917812005 has 12 divisors (see below), whose sum is σ = 6790874220. Its totient is φ = 2089499712.

The previous prime is 3917811983. The next prime is 3917812009. The reversal of 3917812005 is 5002187193.

It can be written as a sum of positive squares in 2 ways, for example, as 1356743556 + 2561068449 = 36834^2 + 50607^2 .

It is not a de Polignac number, because 3917812005 - 2¹¹ = 3917809957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3917812009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43531200 + ... + 43531289.

It is an arithmetic number, because the mean of its divisors is an integer number (565906185).

Almost surely, 2^3917812005 is an apocalyptic number.

It is an amenable number.

3917812005 is a deficient number, since it is larger than the sum of its proper divisors (2873062215).

3917812005 is a wasteful number, since it uses less digits than its factorization.

3917812005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87062500 (or 87062497 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 3917812005 is about 62592.4276969667. The cubic root of 3917812005 is about 1576.4536179363.

Adding to 3917812005 its reverse (5002187193), we get a palindrome (8919999198).

The spelling of 3917812005 in words is "three billion, nine hundred seventeen million, eight hundred twelve thousand, five".