40365491 has 2 divisors, whose sum is σ = 40365492. Its totient is φ = 40365490.

The previous prime is 40365487. The next prime is 40365509. The reversal of 40365491 is 19456304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40365491 - 2² = 40365487 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40365401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20182745 + 20182746.

It is an arithmetic number, because the mean of its divisors is an integer number (20182746).

Almost surely, 2^40365491 is an apocalyptic number.

40365491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40365491 is an equidigital number, since it uses as much as digits as its factorization.

40365491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 40365491 is about 6353.3842163055. The cubic root of 40365491 is about 343.0336674730.

The spelling of 40365491 in words is "forty million, three hundred sixty-five thousand, four hundred ninety-one".