40878017 has 2 divisors, whose sum is σ = 40878018. Its totient is φ = 40878016.

The previous prime is 40877957. The next prime is 40878041. The reversal of 40878017 is 71087804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23580736 + 17297281 = 4856^2 + 4159^2 .

It is a cyclic number.

It is not a de Polignac number, because 40878017 - 2⁸ = 40877761 is a prime.

It is equal to p_2483882 and since 40878017 and 2483882 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40878067) 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, 20439008 + 20439009.

It is an arithmetic number, because the mean of its divisors is an integer number (20439009).

Almost surely, 2^40878017 is an apocalyptic number.

It is an amenable number.

40878017 is a deficient number, since it is larger than the sum of its proper divisors (1).

40878017 is an equidigital number, since it uses as much as digits as its factorization.

40878017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 40878017 is about 6393.5918699898. The cubic root of 40878017 is about 344.4794136964.

The spelling of 40878017 in words is "forty million, eight hundred seventy-eight thousand, seventeen".