18959198 has 4 divisors (see below), whose sum is σ = 28438800. Its totient is φ = 9479598.

The previous prime is 18959177. The next prime is 18959203. The reversal of 18959198 is 89195981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89195981 = 7 ⋅12742283.

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, 4739798 + ... + 4739801.

It is an arithmetic number, because the mean of its divisors is an integer number (7109700).

Almost surely, 2^18959198 is an apocalyptic number.

18959198 is a deficient number, since it is larger than the sum of its proper divisors (9479602).

18959198 is an equidigital number, since it uses as much as digits as its factorization.

18959198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9479601.

The product of its digits is 233280, while the sum is 50.

The square root of 18959198 is about 4354.2161177415. The cubic root of 18959198 is about 266.6490172347.

The spelling of 18959198 in words is "eighteen million, nine hundred fifty-nine thousand, one hundred ninety-eight".