18172000 has 192 divisors, whose sum is σ = 56609280. Its totient is φ = 5568000.

The previous prime is 18171991. The next prime is 18172019. The reversal of 18172000 is 27181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307971 + ... + 308029.

It is an arithmetic number, because the mean of its divisors is an integer number (294840).

Almost surely, 2^18172000 is an apocalyptic number.

18172000 is a gapful number since it is divisible by the number (10) 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 18172000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

18172000 is an abundant number, since it is smaller than the sum of its proper divisors (38437280).

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

18172000 is a wasteful number, since it uses less digits than its factorization.

18172000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 18172000 is about 4262.8628877786. The cubic root of 18172000 is about 262.9062492646.

Adding to 18172000 its reverse (27181), we get a palindrome (18199181).

The spelling of 18172000 in words is "eighteen million, one hundred seventy-two thousand".