18818244 has 45 divisors (see below), whose sum is σ = 49399581. Its totient is φ = 6246720.

The previous prime is 18818213. The next prime is 18818251. The reversal of 18818244 is 44281881.

It is a happy number.

The square root of 18818244 is 4338.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14152644 + 4665600 = 3762^2 + 2160^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18818199 and 18818208.

It is an unprimeable number.

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 14 ways as a sum of consecutive naturals, for example, 77964 + ... + 78204.

Almost surely, 2^18818244 is an apocalyptic number.

18818244 is the 4338-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18818244

18818244 is an abundant number, since it is smaller than the sum of its proper divisors (30581337).

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

18818244 is an equidigital number, since it uses as much as digits as its factorization.

18818244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 246 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The cubic root of 18818244 is about 265.9865634760.

Multiplying 18818244 by its sum of digits (36), we get a square (677456784 = 26028²).

18818244 divided by its sum of digits (36) gives a square (522729 = 723²).

Multiplying 18818244 by its product of digits (16384), we get a square (308318109696 = 555264²).

The spelling of 18818244 in words is "eighteen million, eight hundred eighteen thousand, two hundred forty-four".