18946318 has 4 divisors (see below), whose sum is σ = 28419480. Its totient is φ = 9473158.

The previous prime is 18946307. The next prime is 18946337. The reversal of 18946318 is 81364981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81364981 = 29 ⋅2805689.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4736578 + ... + 4736581.

It is an arithmetic number, because the mean of its divisors is an integer number (7104870).

Almost surely, 2^18946318 is an apocalyptic number.

18946318 is a deficient number, since it is larger than the sum of its proper divisors (9473162).

18946318 is an equidigital number, since it uses as much as digits as its factorization.

18946318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473161.

The product of its digits is 41472, while the sum is 40.

The square root of 18946318 is about 4352.7368401961. The cubic root of 18946318 is about 266.5886205630.

The spelling of 18946318 in words is "eighteen million, nine hundred forty-six thousand, three hundred eighteen".