18163816 has 16 divisors (see below), whose sum is σ = 37153440. Its totient is φ = 8256240.

The previous prime is 18163811. The next prime is 18163823. The reversal of 18163816 is 61836181.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18163811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103116 + ... + 103291.

It is an arithmetic number, because the mean of its divisors is an integer number (2322090).

Almost surely, 2^18163816 is an apocalyptic number.

It is an amenable number.

18163816 is an abundant number, since it is smaller than the sum of its proper divisors (18989624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18163816 is a wasteful number, since it uses less digits than its factorization.

18163816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206424 (or 206420 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 18163816 is about 4261.9028613989. The cubic root of 18163816 is about 262.8667755719.

Adding to 18163816 its reverse (61836181), we get a palindrome (79999997).

The spelling of 18163816 in words is "eighteen million, one hundred sixty-three thousand, eight hundred sixteen".