40342091 has 2 divisors, whose sum is σ = 40342092. Its totient is φ = 40342090.

The previous prime is 40342079. The next prime is 40342117. The reversal of 40342091 is 19024304.

40342091 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 40342091 - 2¹⁸ = 40079947 is a prime.

It is not a weakly prime, because it can be changed into another prime (40342021) 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, 20171045 + 20171046.

It is an arithmetic number, because the mean of its divisors is an integer number (20171046).

Almost surely, 2^40342091 is an apocalyptic number.

40342091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40342091 is an equidigital number, since it uses as much as digits as its factorization.

40342091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40342091 is about 6351.5424110998. The cubic root of 40342091 is about 342.9673687674.

Adding to 40342091 its reverse (19024304), we get a palindrome (59366395).

The spelling of 40342091 in words is "forty million, three hundred forty-two thousand, ninety-one".