40804891 has 2 divisors, whose sum is σ = 40804892. Its totient is φ = 40804890.

The previous prime is 40804889. The next prime is 40804901. The reversal of 40804891 is 19840804.

40804891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40804891 - 2¹ = 40804889 is a prime.

Together with 40804889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40804801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20402445 + 20402446.

It is an arithmetic number, because the mean of its divisors is an integer number (20402446).

Almost surely, 2^40804891 is an apocalyptic number.

40804891 is a deficient number, since it is larger than the sum of its proper divisors (1).

40804891 is an equidigital number, since it uses as much as digits as its factorization.

40804891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 40804891 is about 6387.8706154712. The cubic root of 40804891 is about 344.2738799377.

The spelling of 40804891 in words is "forty million, eight hundred four thousand, eight hundred ninety-one".