40121443 has 2 divisors, whose sum is σ = 40121444. Its totient is φ = 40121442.

The previous prime is 40121437. The next prime is 40121447. The reversal of 40121443 is 34412104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40121443 - 2⁹ = 40120931 is a prime.

It is equal to p_2440612 and since 40121443 and 2440612 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40121443.

It is not a weakly prime, because it can be changed into another prime (40121447) 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, 20060721 + 20060722.

It is an arithmetic number, because the mean of its divisors is an integer number (20060722).

Almost surely, 2^40121443 is an apocalyptic number.

40121443 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121443 is an equidigital number, since it uses as much as digits as its factorization.

40121443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40121443 is about 6334.1489562529. The cubic root of 40121443 is about 342.3409473368.

Adding to 40121443 its reverse (34412104), we get a palindrome (74533547).

The spelling of 40121443 in words is "forty million, one hundred twenty-one thousand, four hundred forty-three".