16422257 has 2 divisors, whose sum is σ = 16422258. Its totient is φ = 16422256.

The previous prime is 16422247. The next prime is 16422269. The reversal of 16422257 is 75222461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15689521 + 732736 = 3961^2 + 856^2 .

It is a cyclic number.

It is not a de Polignac number, because 16422257 - 2⁶ = 16422193 is a prime.

It is not a weakly prime, because it can be changed into another prime (16422227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211128 + 8211129.

It is an arithmetic number, because the mean of its divisors is an integer number (8211129).

Almost surely, 2^16422257 is an apocalyptic number.

It is an amenable number.

16422257 is a deficient number, since it is larger than the sum of its proper divisors (1).

16422257 is an equidigital number, since it uses as much as digits as its factorization.

16422257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 29.

The square root of 16422257 is about 4052.4384017527. The cubic root of 16422257 is about 254.1817008516.

The spelling of 16422257 in words is "sixteen million, four hundred twenty-two thousand, two hundred fifty-seven".