400043607893 has 2 divisors, whose sum is σ = 400043607894. Its totient is φ = 400043607892.

The previous prime is 400043607833. The next prime is 400043607907. The reversal of 400043607893 is 398706340004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365930626084 + 34112981809 = 604922^2 + 184697^2 .

It is a cyclic number.

It is not a de Polignac number, because 400043607893 - 2⁶ = 400043607829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400043607833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200021803946 + 200021803947.

It is an arithmetic number, because the mean of its divisors is an integer number (200021803947).

Almost surely, 2^400043607893 is an apocalyptic number.

It is an amenable number.

400043607893 is a deficient number, since it is larger than the sum of its proper divisors (1).

400043607893 is an equidigital number, since it uses as much as digits as its factorization.

400043607893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 44.

Adding to 400043607893 its reverse (398706340004), we get a palindrome (798749947897).

The spelling of 400043607893 in words is "four hundred billion, forty-three million, six hundred seven thousand, eight hundred ninety-three".