18416844 has 18 divisors (see below), whose sum is σ = 46553780. Its totient is φ = 6138936.

The previous prime is 18416843. The next prime is 18416851. The reversal of 18416844 is 44861481.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 511579 = 18416844 / (1 + 8 + 4 + 1 + 6 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 18416799 and 18416808.

It is not an unprimeable number, because it can be changed into a prime (18416843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255754 + ... + 255825.

Almost surely, 2^18416844 is an apocalyptic number.

It is an amenable number.

18416844 is an abundant number, since it is smaller than the sum of its proper divisors (28136936).

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

18416844 is a wasteful number, since it uses less digits than its factorization.

18416844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511589 (or 511584 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 18416844 is about 4291.4850576461. The cubic root of 18416844 is about 264.0817584241.

The spelling of 18416844 in words is "eighteen million, four hundred sixteen thousand, eight hundred forty-four".