16621338 has 16 divisors (see below), whose sum is σ = 33586560. Its totient is φ = 5483136.

The previous prime is 16621309. The next prime is 16621357. The reversal of 16621338 is 83312661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13698 + ... + 14861.

It is an arithmetic number, because the mean of its divisors is an integer number (2099160).

Almost surely, 2^16621338 is an apocalyptic number.

16621338 is an abundant number, since it is smaller than the sum of its proper divisors (16965222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16621338 is a wasteful number, since it uses less digits than its factorization.

16621338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28661.

The product of its digits is 5184, while the sum is 30.

The square root of 16621338 is about 4076.9275195912. The cubic root of 16621338 is about 255.2046953110.

Adding to 16621338 its reverse (83312661), we get a palindrome (99933999).

The spelling of 16621338 in words is "sixteen million, six hundred twenty-one thousand, three hundred thirty-eight".