40891867 has 2 divisors, whose sum is σ = 40891868. Its totient is φ = 40891866.

The previous prime is 40891849. The next prime is 40891931. The reversal of 40891867 is 76819804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40891867 - 2¹¹ = 40889819 is a prime.

It is not a weakly prime, because it can be changed into another prime (40891847) 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, 20445933 + 20445934.

It is an arithmetic number, because the mean of its divisors is an integer number (20445934).

Almost surely, 2^40891867 is an apocalyptic number.

40891867 is a deficient number, since it is larger than the sum of its proper divisors (1).

40891867 is an equidigital number, since it uses as much as digits as its factorization.

40891867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 40891867 is about 6394.6748940036. The cubic root of 40891867 is about 344.5183139946.

The spelling of 40891867 in words is "forty million, eight hundred ninety-one thousand, eight hundred sixty-seven".