18944818 has 8 divisors (see below), whose sum is σ = 28447020. Its totient is φ = 9462480.

The previous prime is 18944803. The next prime is 18944839. The reversal of 18944818 is 81844981.

It can be written as a sum of positive squares in 2 ways, for example, as 17032129 + 1912689 = 4127^2 + 1383^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18944818² = 717812258106248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2293 + ... + 6568.

Almost surely, 2^18944818 is an apocalyptic number.

18944818 is a deficient number, since it is larger than the sum of its proper divisors (9502202).

18944818 is a wasteful number, since it uses less digits than its factorization.

18944818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9932.

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

The square root of 18944818 is about 4352.5645313999. The cubic root of 18944818 is about 266.5815850098.

The spelling of 18944818 in words is "eighteen million, nine hundred forty-four thousand, eight hundred eighteen".