18597216 has 72 divisors (see below), whose sum is σ = 53692632. Its totient is φ = 5632000.

The previous prime is 18597211. The next prime is 18597217. The reversal of 18597216 is 61279581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18597211) 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 11 ways as a sum of consecutive naturals, for example, 10816 + ... + 12416.

It is an arithmetic number, because the mean of its divisors is an integer number (745731).

Almost surely, 2^18597216 is an apocalyptic number.

18597216 is a gapful number since it is divisible by the number (16) 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 18597216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26846316).

18597216 is an abundant number, since it is smaller than the sum of its proper divisors (35095416).

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

18597216 is a wasteful number, since it uses less digits than its factorization.

18597216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636 (or 1617 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 18597216 is about 4312.4489562197. The cubic root of 18597216 is about 264.9410857522.

The spelling of 18597216 in words is "eighteen million, five hundred ninety-seven thousand, two hundred sixteen".