400011043 has 2 divisors, whose sum is σ = 400011044. Its totient is φ = 400011042.

The previous prime is 400011041. The next prime is 400011097. The reversal of 400011043 is 340110004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400011043 - 2¹ = 400011041 is a prime.

Together with 400011041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (400011041) 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, 200005521 + 200005522.

It is an arithmetic number, because the mean of its divisors is an integer number (200005522).

Almost surely, 2^400011043 is an apocalyptic number.

400011043 is a deficient number, since it is larger than the sum of its proper divisors (1).

400011043 is an equidigital number, since it uses as much as digits as its factorization.

400011043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400011043 is about 20000.2760730946. The cubic root of 400011043 is about 736.8130801257.

Adding to 400011043 its reverse (340110004), we get a palindrome (740121047).

The spelling of 400011043 in words is "four hundred million, eleven thousand, forty-three".