16742218 has 4 divisors (see below), whose sum is σ = 25113330. Its totient is φ = 8371108.

The previous prime is 16742203. The next prime is 16742237. The reversal of 16742218 is 81224761.

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., 13271449 + 3470769 = 3643^2 + 1863^2 .

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 a self number, because there is not a number n which added to its sum of digits gives 16742218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4185553 + ... + 4185556.

Almost surely, 2^16742218 is an apocalyptic number.

16742218 is a deficient number, since it is larger than the sum of its proper divisors (8371112).

16742218 is an equidigital number, since it uses as much as digits as its factorization.

16742218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8371111.

The product of its digits is 5376, while the sum is 31.

The square root of 16742218 is about 4091.7255528689. The cubic root of 16742218 is about 255.8218670450.

Adding to 16742218 its reverse (81224761), we get a palindrome (97966979).

The spelling of 16742218 in words is "sixteen million, seven hundred forty-two thousand, two hundred eighteen".