18215472 has 40 divisors (see below), whose sum is σ = 51336000. Its totient is φ = 5519680.

The previous prime is 18215467. The next prime is 18215473. The reversal of 18215472 is 27451281.

It is not an unprimeable number, because it can be changed into a prime (18215473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16722 + ... + 17777.

It is an arithmetic number, because the mean of its divisors is an integer number (1283400).

Almost surely, 2^18215472 is an apocalyptic number.

18215472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18215472 is an abundant number, since it is smaller than the sum of its proper divisors (33120528).

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

18215472 is a wasteful number, since it uses less digits than its factorization.

18215472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34521 (or 34515 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 18215472 is about 4267.9587626874. The cubic root of 18215472 is about 263.1157282952.

The spelling of 18215472 in words is "eighteen million, two hundred fifteen thousand, four hundred seventy-two".