400444484849 has 2 divisors, whose sum is σ = 400444484850. Its totient is φ = 400444484848.

The previous prime is 400444484831. The next prime is 400444484873. The reversal of 400444484849 is 948484444004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235169713249 + 165274771600 = 484943^2 + 406540^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444484849 - 2¹² = 400444480753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400444484849.

It is not a weakly prime, because it can be changed into another prime (400444484149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200222242424 + 200222242425.

It is an arithmetic number, because the mean of its divisors is an integer number (200222242425).

Almost surely, 2^400444484849 is an apocalyptic number.

It is an amenable number.

400444484849 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444484849 is an equidigital number, since it uses as much as digits as its factorization.

400444484849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9437184, while the sum is 53.

The spelling of 400444484849 in words is "four hundred billion, four hundred forty-four million, four hundred eighty-four thousand, eight hundred forty-nine".