400008043 has 2 divisors, whose sum is σ = 400008044. Its totient is φ = 400008042.

The previous prime is 400008017. The next prime is 400008101. The reversal of 400008043 is 340800004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400008043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400008043.

It is not a weakly prime, because it can be changed into another prime (400008143) 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, 200004021 + 200004022.

It is an arithmetic number, because the mean of its divisors is an integer number (200004022).

Almost surely, 2^400008043 is an apocalyptic number.

400008043 is a deficient number, since it is larger than the sum of its proper divisors (1).

400008043 is an equidigital number, since it uses as much as digits as its factorization.

400008043 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 400008043 is about 20000.2010739892. The cubic root of 400008043 is about 736.8112381392.

Adding to 400008043 its reverse (340800004), we get a palindrome (740808047).

The spelling of 400008043 in words is "four hundred million, eight thousand, forty-three".