16822138 has 4 divisors (see below), whose sum is σ = 25233210. Its totient is φ = 8411068.

The previous prime is 16822133. The next prime is 16822187. The reversal of 16822138 is 83122861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14768649 + 2053489 = 3843^2 + 1433^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (16822133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4205533 + ... + 4205536.

Almost surely, 2^16822138 is an apocalyptic number.

16822138 is a deficient number, since it is larger than the sum of its proper divisors (8411072).

16822138 is an equidigital number, since it uses as much as digits as its factorization.

16822138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8411071.

The product of its digits is 4608, while the sum is 31.

The square root of 16822138 is about 4101.4799767889. The cubic root of 16822138 is about 256.2282814827.

Adding to 16822138 its reverse (83122861), we get a palindrome (99944999).

The spelling of 16822138 in words is "sixteen million, eight hundred twenty-two thousand, one hundred thirty-eight".