400444112009 has 2 divisors, whose sum is σ = 400444112010. Its totient is φ = 400444112008.

The previous prime is 400444111993. The next prime is 400444112011. The reversal of 400444112009 is 900211444004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267292102009 + 133152010000 = 517003^2 + 364900^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444112009 - 2⁴ = 400444111993 is a prime.

Together with 400444112011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400444162009) 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, 200222056004 + 200222056005.

It is an arithmetic number, because the mean of its divisors is an integer number (200222056005).

Almost surely, 2^400444112009 is an apocalyptic number.

It is an amenable number.

400444112009 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444112009 is an equidigital number, since it uses as much as digits as its factorization.

400444112009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 400444112009 in words is "four hundred billion, four hundred forty-four million, one hundred twelve thousand, nine".