16638338 has 16 divisors (see below), whose sum is σ = 27414720. Its totient is φ = 7538256.

The previous prime is 16638331. The next prime is 16638371. The reversal of 16638338 is 83383661.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (16638331) 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 7 ways as a sum of consecutive naturals, for example, 8645 + ... + 10392.

It is an arithmetic number, because the mean of its divisors is an integer number (1713420).

Almost surely, 2^16638338 is an apocalyptic number.

16638338 is a deficient number, since it is larger than the sum of its proper divisors (10776382).

16638338 is a wasteful number, since it uses less digits than its factorization.

16638338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19081.

The product of its digits is 62208, while the sum is 38.

The square root of 16638338 is about 4079.0118901518. The cubic root of 16638338 is about 255.2916718940.

It can be divided in two parts, 1663 and 8338, that added together give a palindrome (10001).

The spelling of 16638338 in words is "sixteen million, six hundred thirty-eight thousand, three hundred thirty-eight".