18819844 has 12 divisors (see below), whose sum is σ = 32975964. Its totient is φ = 9398144.

The previous prime is 18819841. The next prime is 18819847. The reversal of 18819844 is 44891881.

It is an interprime number because it is at equal distance from previous prime (18819841) and next prime (18819847).

It can be written as a sum of positive squares in 2 ways, for example, as 8008900 + 10810944 = 2830^2 + 3288^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18819844.

It is not an unprimeable number, because it can be changed into a prime (18819841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344 + ... + 6280.

It is an arithmetic number, because the mean of its divisors is an integer number (2747997).

Almost surely, 2^18819844 is an apocalyptic number.

It is an amenable number.

18819844 is a deficient number, since it is larger than the sum of its proper divisors (14156120).

18819844 is a wasteful number, since it uses less digits than its factorization.

18819844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5894 (or 5892 counting only the distinct ones).

The product of its digits is 73728, while the sum is 43.

The square root of 18819844 is about 4338.1844128621. The cubic root of 18819844 is about 265.9941016651.

The spelling of 18819844 in words is "eighteen million, eight hundred nineteen thousand, eight hundred forty-four".