400404789063809 has 2 divisors, whose sum is σ = 400404789063810. Its totient is φ = 400404789063808.

The previous prime is 400404789063707. The next prime is 400404789063913. The reversal of 400404789063809 is 908360987404004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382829451696784 + 17575337367025 = 19566028^2 + 4192295^2 .

It is a cyclic number.

It is not a de Polignac number, because 400404789063809 - 2¹² = 400404789059713 is a prime.

It is not a weakly prime, because it can be changed into another prime (400404789963809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200202394531904 + 200202394531905.

It is an arithmetic number, because the mean of its divisors is an integer number (200202394531905).

Almost surely, 2^{400404789063809} is an apocalyptic number.

It is an amenable number.

400404789063809 is a deficient number, since it is larger than the sum of its proper divisors (1).

400404789063809 is an equidigital number, since it uses as much as digits as its factorization.

400404789063809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41803776, while the sum is 62.

The spelling of 400404789063809 in words is "four hundred trillion, four hundred four billion, seven hundred eighty-nine million, sixty-three thousand, eight hundred nine".