18171472 has 60 divisors (see below), whose sum is σ = 40684896. Its totient is φ = 7782720.

The previous prime is 18171463. The next prime is 18171481. The reversal of 18171472 is 27417181.

It is an interprime number because it is at equal distance from previous prime (18171463) and next prime (18171481).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271183 + ... + 271249.

Almost surely, 2^18171472 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 18171472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20342448).

18171472 is an abundant number, since it is smaller than the sum of its proper divisors (22513424).

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

18171472 is a wasteful number, since it uses less digits than its factorization.

18171472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 103 counting only the distinct ones).

The product of its digits is 3136, while the sum is 31.

The square root of 18171472 is about 4262.8009571173. The cubic root of 18171472 is about 262.9037029324.

The spelling of 18171472 in words is "eighteen million, one hundred seventy-one thousand, four hundred seventy-two".