16440818 has 4 divisors (see below), whose sum is σ = 24661230. Its totient is φ = 8220408.

The previous prime is 16440811. The next prime is 16440829. The reversal of 16440818 is 81804461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81804461 = 3547 ⋅23063.

It can be written as a sum of positive squares in only one way, i.e., 10647169 + 5793649 = 3263^2 + 2407^2 .

It is a super-3 number, since 3×16440818³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16440811) by changing a digit.

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, 4110203 + ... + 4110206.

Almost surely, 2^16440818 is an apocalyptic number.

16440818 is a deficient number, since it is larger than the sum of its proper divisors (8220412).

16440818 is an equidigital number, since it uses as much as digits as its factorization.

16440818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8220411.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 16440818 is about 4054.7278576990. The cubic root of 16440818 is about 254.2774264317.

The spelling of 16440818 in words is "sixteen million, four hundred forty thousand, eight hundred eighteen".