40385840491 has 2 divisors, whose sum is σ = 40385840492. Its totient is φ = 40385840490.

The previous prime is 40385840477. The next prime is 40385840497. The reversal of 40385840491 is 19404858304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40385840491 - 2²¹ = 40383743339 is a prime.

It is a super-2 number, since 2×40385840491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40385840497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20192920245 + 20192920246.

It is an arithmetic number, because the mean of its divisors is an integer number (20192920246).

Almost surely, 2^40385840491 is an apocalyptic number.

40385840491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40385840491 is an equidigital number, since it uses as much as digits as its factorization.

40385840491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 40385840491 in words is "forty billion, three hundred eighty-five million, eight hundred forty thousand, four hundred ninety-one".