16887418 has 4 divisors (see below), whose sum is σ = 25331130. Its totient is φ = 8443708.

The previous prime is 16887413. The next prime is 16887419. The reversal of 16887418 is 81478861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81478861 = 53 ⋅1537337.

It can be written as a sum of positive squares in only one way, i.e., 10870209 + 6017209 = 3297^2 + 2453^2 .

It is not an unprimeable number, because it can be changed into a prime (16887413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4221853 + ... + 4221856.

Almost surely, 2^16887418 is an apocalyptic number.

16887418 is a deficient number, since it is larger than the sum of its proper divisors (8443712).

16887418 is an equidigital number, since it uses as much as digits as its factorization.

16887418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443711.

The product of its digits is 86016, while the sum is 43.

The square root of 16887418 is about 4109.4303741516. The cubic root of 16887418 is about 256.5592935563.

The spelling of 16887418 in words is "sixteen million, eight hundred eighty-seven thousand, four hundred eighteen".