40026191 has 2 divisors, whose sum is σ = 40026192. Its totient is φ = 40026190.

The previous prime is 40026167. The next prime is 40026197. The reversal of 40026191 is 19162004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40026191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40026197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20013095 + 20013096.

It is an arithmetic number, because the mean of its divisors is an integer number (20013096).

Almost surely, 2^40026191 is an apocalyptic number.

40026191 is a deficient number, since it is larger than the sum of its proper divisors (1).

40026191 is an equidigital number, since it uses as much as digits as its factorization.

40026191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 40026191 is about 6326.6255618616. The cubic root of 40026191 is about 342.0698163498.

Adding to 40026191 its reverse (19162004), we get a palindrome (59188195).

The spelling of 40026191 in words is "forty million, twenty-six thousand, one hundred ninety-one".