400222189 has 2 divisors, whose sum is σ = 400222190. Its totient is φ = 400222188.

The previous prime is 400222181. The next prime is 400222247. The reversal of 400222189 is 981222004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325261225 + 74960964 = 18035^2 + 8658^2 .

It is a cyclic number.

It is not a de Polignac number, because 400222189 - 2³ = 400222181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400222181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200111094 + 200111095.

It is an arithmetic number, because the mean of its divisors is an integer number (200111095).

Almost surely, 2^400222189 is an apocalyptic number.

It is an amenable number.

400222189 is a deficient number, since it is larger than the sum of its proper divisors (1).

400222189 is an equidigital number, since it uses as much as digits as its factorization.

400222189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 400222189 is about 20005.5539538399. The cubic root of 400222189 is about 736.9426996882.

The spelling of 400222189 in words is "four hundred million, two hundred twenty-two thousand, one hundred eighty-nine".