16638226 has 24 divisors (see below), whose sum is σ = 27650700. Its totient is φ = 7502880.

The previous prime is 16638221. The next prime is 16638247. The reversal of 16638226 is 62283661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13579225 + 3059001 = 3685^2 + 1749^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16638191 and 16638200.

It is not an unprimeable number, because it can be changed into a prime (16638221) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 47500 + ... + 47848.

Almost surely, 2^16638226 is an apocalyptic number.

16638226 is a deficient number, since it is larger than the sum of its proper divisors (11012474).

16638226 is a wasteful number, since it uses less digits than its factorization.

16638226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 559 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 16638226 is about 4078.9981613136. The cubic root of 16638226 is about 255.2910990658.

It can be divided in two parts, 1663 and 8226, that added together give a palindrome (9889).

The spelling of 16638226 in words is "sixteen million, six hundred thirty-eight thousand, two hundred twenty-six".