16638241 has 3 divisors (see below), whose sum is σ = 16642321. Its totient is φ = 16634162.

The previous prime is 16638221. The next prime is 16638247. The reversal of 16638241 is 14283661.

It is a happy number.

The square root of 16638241 is 4079.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 16638241 - 2⁷ = 16638113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16638247) 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 2 ways as a sum of consecutive naturals, for example, 2040 + ... + 6118.

Almost surely, 2^16638241 is an apocalyptic number.

16638241 is the 4079-th square number.

16638241 is the 2040-th centered octagonal number.

It is an amenable number.

16638241 is a deficient number, since it is larger than the sum of its proper divisors (4080).

16638241 is an frugal number, since it uses more digits than its factorization.

16638241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8158 (or 4079 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The cubic root of 16638241 is about 255.2911757840.

The spelling of 16638241 in words is "sixteen million, six hundred thirty-eight thousand, two hundred forty-one".