18398232 has 64 divisors (see below), whose sum is σ = 53808000. Its totient is φ = 5808672.

The previous prime is 18398227. The next prime is 18398257. The reversal of 18398232 is 23289381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1863 + ... + 6345.

It is an arithmetic number, because the mean of its divisors is an integer number (840750).

Almost surely, 2^18398232 is an apocalyptic number.

18398232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18398232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26904000).

18398232 is an abundant number, since it is smaller than the sum of its proper divisors (35409768).

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

18398232 is a wasteful number, since it uses less digits than its factorization.

18398232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517 (or 4507 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18398232 is about 4289.3160293921. The cubic root of 18398232 is about 263.9927683970.

The spelling of 18398232 in words is "eighteen million, three hundred ninety-eight thousand, two hundred thirty-two".