400441242209 has 2 divisors, whose sum is σ = 400441242210. Its totient is φ = 400441242208.

The previous prime is 400441242203. The next prime is 400441242233. The reversal of 400441242209 is 902242144004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256461216400 + 143980025809 = 506420^2 + 379447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400441242209 is a prime.

It is not a weakly prime, because it can be changed into another prime (400441242203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200220621104 + 200220621105.

It is an arithmetic number, because the mean of its divisors is an integer number (200220621105).

Almost surely, 2^400441242209 is an apocalyptic number.

It is an amenable number.

400441242209 is a deficient number, since it is larger than the sum of its proper divisors (1).

400441242209 is an equidigital number, since it uses as much as digits as its factorization.

400441242209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 400441242209 in words is "four hundred billion, four hundred forty-one million, two hundred forty-two thousand, two hundred nine".