18409198 has 8 divisors (see below), whose sum is σ = 29238192. Its totient is φ = 8663136.

The previous prime is 18409163. The next prime is 18409199. The reversal of 18409198 is 89190481.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18409198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18409199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270690 + ... + 270757.

It is an arithmetic number, because the mean of its divisors is an integer number (3654774).

Almost surely, 2^18409198 is an apocalyptic number.

18409198 is a deficient number, since it is larger than the sum of its proper divisors (10828994).

18409198 is a wasteful number, since it uses less digits than its factorization.

18409198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541466.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18409198 is about 4290.5941313529. The cubic root of 18409198 is about 264.0452076698.

The spelling of 18409198 in words is "eighteen million, four hundred nine thousand, one hundred ninety-eight".