16518418 has 16 divisors (see below), whose sum is σ = 28433664. Its totient is φ = 7050240.

The previous prime is 16518413. The next prime is 16518431. The reversal of 16518418 is 81481561.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16518413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1303 + ... + 5893.

It is an arithmetic number, because the mean of its divisors is an integer number (1777104).

Almost surely, 2^16518418 is an apocalyptic number.

16518418 is a deficient number, since it is larger than the sum of its proper divisors (11915246).

16518418 is a wasteful number, since it uses less digits than its factorization.

16518418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4857.

The product of its digits is 7680, while the sum is 34.

The square root of 16518418 is about 4064.2856690936. The cubic root of 16518418 is about 254.6768583984.

Adding to 16518418 its reverse (81481561), we get a palindrome (97999979).

The spelling of 16518418 in words is "sixteen million, five hundred eighteen thousand, four hundred eighteen".