18818844 has 24 divisors (see below), whose sum is σ = 47902848. Its totient is φ = 5702640.

The previous prime is 18818831. The next prime is 18818857. The reversal of 18818844 is 44881881.

It is an interprime number because it is at equal distance from previous prime (18818831) and next prime (18818857).

It is a junction number, because it is equal to n+sod(n) for n = 18818796 and 18818805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71152 + ... + 71415.

It is an arithmetic number, because the mean of its divisors is an integer number (1995952).

Almost surely, 2^18818844 is an apocalyptic number.

It is an amenable number.

18818844 is an abundant number, since it is smaller than the sum of its proper divisors (29084004).

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

18818844 is a wasteful number, since it uses less digits than its factorization.

18818844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142585 (or 142583 counting only the distinct ones).

The product of its digits is 65536, while the sum is 42.

The square root of 18818844 is about 4338.0691557420. The cubic root of 18818844 is about 265.9893903470.

The spelling of 18818844 in words is "eighteen million, eight hundred eighteen thousand, eight hundred forty-four".