40440091 has 2 divisors, whose sum is σ = 40440092. Its totient is φ = 40440090.

The previous prime is 40440079. The next prime is 40440119. The reversal of 40440091 is 19004404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40440091 - 2⁹ = 40439579 is a prime.

It is not a weakly prime, because it can be changed into another prime (40440791) 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, 20220045 + 20220046.

It is an arithmetic number, because the mean of its divisors is an integer number (20220046).

Almost surely, 2^40440091 is an apocalyptic number.

40440091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40440091 is an equidigital number, since it uses as much as digits as its factorization.

40440091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40440091 is about 6359.2523931670. The cubic root of 40440091 is about 343.2448591165.

Adding to 40440091 its reverse (19004404), we get a palindrome (59444495).

The spelling of 40440091 in words is "forty million, four hundred forty thousand, ninety-one".