400445198189 has 2 divisors, whose sum is σ = 400445198190. Its totient is φ = 400445198188.

The previous prime is 400445198143. The next prime is 400445198203. The reversal of 400445198189 is 981891544004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311885390089 + 88559808100 = 558467^2 + 297590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400445198189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400445198189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400445198129) 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, 200222599094 + 200222599095.

It is an arithmetic number, because the mean of its divisors is an integer number (200222599095).

Almost surely, 2^400445198189 is an apocalyptic number.

It is an amenable number.

400445198189 is a deficient number, since it is larger than the sum of its proper divisors (1).

400445198189 is an equidigital number, since it uses as much as digits as its factorization.

400445198189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 400445198189 in words is "four hundred billion, four hundred forty-five million, one hundred ninety-eight thousand, one hundred eighty-nine".