43440091 has 2 divisors, whose sum is σ = 43440092. Its totient is φ = 43440090.

The previous prime is 43440073. The next prime is 43440119. The reversal of 43440091 is 19004434.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43440091 - 2¹⁵ = 43407323 is a prime.

It is not a weakly prime, because it can be changed into another prime (43440011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21720045 + 21720046.

It is an arithmetic number, because the mean of its divisors is an integer number (21720046).

Almost surely, 2^43440091 is an apocalyptic number.

43440091 is a deficient number, since it is larger than the sum of its proper divisors (1).

43440091 is an equidigital number, since it uses as much as digits as its factorization.

43440091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 43440091 is about 6590.9097247649. The cubic root of 43440091 is about 351.5309561730.

The spelling of 43440091 in words is "forty-three million, four hundred forty thousand, ninety-one".