18874018 has 4 divisors (see below), whose sum is σ = 28311030. Its totient is φ = 9437008.

The previous prime is 18874013. The next prime is 18874019. The reversal of 18874018 is 81047881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81047881 = 47 ⋅1724423.

It can be written as a sum of positive squares in only one way, i.e., 17581249 + 1292769 = 4193^2 + 1137^2 .

It is not an unprimeable number, because it can be changed into a prime (18874013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4718503 + ... + 4718506.

Almost surely, 2^18874018 is an apocalyptic number.

18874018 is a deficient number, since it is larger than the sum of its proper divisors (9437012).

18874018 is an equidigital number, since it uses as much as digits as its factorization.

18874018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9437011.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 18874018 is about 4344.4237822754. The cubic root of 18874018 is about 266.2490835855.

The spelling of 18874018 in words is "eighteen million, eight hundred seventy-four thousand, eighteen".