40518791 has 2 divisors, whose sum is σ = 40518792. Its totient is φ = 40518790.

The previous prime is 40518787. The next prime is 40518817. The reversal of 40518791 is 19781504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40518791 - 2² = 40518787 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40518721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20259395 + 20259396.

It is an arithmetic number, because the mean of its divisors is an integer number (20259396).

Almost surely, 2^40518791 is an apocalyptic number.

40518791 is a deficient number, since it is larger than the sum of its proper divisors (1).

40518791 is an equidigital number, since it uses as much as digits as its factorization.

40518791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 40518791 is about 6365.4372198616. The cubic root of 40518791 is about 343.4673764683.

The spelling of 40518791 in words is "forty million, five hundred eighteen thousand, seven hundred ninety-one".