18398208 has 88 divisors (see below), whose sum is σ = 50405328. Its totient is φ = 5963776.

The previous prime is 18398207. The next prime is 18398227. The reversal of 18398208 is 80289381.

It is a super-2 number, since 2×18398208² = 676988115222528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398201) 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, 162760 + ... + 162872.

Almost surely, 2^18398208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18398208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25202664).

18398208 is an abundant number, since it is smaller than the sum of its proper divisors (32007120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18398208 is a wasteful number, since it uses less digits than its factorization.

18398208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 18398208 is about 4289.3132317423. The cubic root of 18398208 is about 263.9926536064.

The spelling of 18398208 in words is "eighteen million, three hundred ninety-eight thousand, two hundred eight".