18198397 has 8 divisors (see below), whose sum is σ = 20825856. Its totient is φ = 15577872.

The previous prime is 18198391. The next prime is 18198407. The reversal of 18198397 is 79389181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18198397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6543 + ... + 8899.

It is an arithmetic number, because the mean of its divisors is an integer number (2603232).

Almost surely, 2^18198397 is an apocalyptic number.

It is an amenable number.

18198397 is a deficient number, since it is larger than the sum of its proper divisors (2627459).

18198397 is a wasteful number, since it uses less digits than its factorization.

18198397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467.

The product of its digits is 108864, while the sum is 46.

The square root of 18198397 is about 4265.9579229055. The cubic root of 18198397 is about 263.0334885816.

The spelling of 18198397 in words is "eighteen million, one hundred ninety-eight thousand, three hundred ninety-seven".