400222001 has 2 divisors, whose sum is σ = 400222002. Its totient is φ = 400222000.

The previous prime is 400221961. The next prime is 400222019. The reversal of 400222001 is 100222004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 369408400 + 30813601 = 19220^2 + 5551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400222001 is a prime.

It is not a weakly prime, because it can be changed into another prime (400221001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200111000 + 200111001.

It is an arithmetic number, because the mean of its divisors is an integer number (200111001).

Almost surely, 2^400222001 is an apocalyptic number.

It is an amenable number.

400222001 is a deficient number, since it is larger than the sum of its proper divisors (1).

400222001 is an equidigital number, since it uses as much as digits as its factorization.

400222001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 400222001 is about 20005.5492551442. The cubic root of 400222001 is about 736.9425842979.

Adding to 400222001 its reverse (100222004), we get a palindrome (500444005).

The spelling of 400222001 in words is "four hundred million, two hundred twenty-two thousand, one".