422405257 has 2 divisors, whose sum is σ = 422405258. Its totient is φ = 422405256.

The previous prime is 422405251. The next prime is 422405299. The reversal of 422405257 is 752504224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385572496 + 36832761 = 19636^2 + 6069^2 .

It is a cyclic number.

It is not a de Polignac number, because 422405257 - 2¹¹ = 422403209 is a prime.

It is a super-2 number, since 2×422405257² = 356852402282472098, which contains 22 as substring.

It is the 20553-rd Hogben number.

It is not a weakly prime, because it can be changed into another prime (422405251) by changing a digit.

It is a nontrivial repunit in base 20552.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211202628 + 211202629.

It is an arithmetic number, because the mean of its divisors is an integer number (211202629).

Almost surely, 2^422405257 is an apocalyptic number.

It is an amenable number.

422405257 is a deficient number, since it is larger than the sum of its proper divisors (1).

422405257 is an equidigital number, since it uses as much as digits as its factorization.

422405257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 422405257 is about 20552.5000182460. The cubic root of 422405257 is about 750.3140948113.

The spelling of 422405257 in words is "four hundred twenty-two million, four hundred five thousand, two hundred fifty-seven".