18975216 has 80 divisors (see below), whose sum is σ = 53996544. Its totient is φ = 5705472.

The previous prime is 18975199. The next prime is 18975217. The reversal of 18975216 is 61257981.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18975217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29005 + ... + 29651.

Almost surely, 2^18975216 is an apocalyptic number.

18975216 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 18975216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26998272).

18975216 is an abundant number, since it is smaller than the sum of its proper divisors (35021328).

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

18975216 is a wasteful number, since it uses less digits than its factorization.

18975216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 712 counting only the distinct ones).

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

The square root of 18975216 is about 4356.0550960703. The cubic root of 18975216 is about 266.7240904113.

It can be divided in two parts, 18975 and 216, that added together give a palindrome (19191).

The spelling of 18975216 in words is "eighteen million, nine hundred seventy-five thousand, two hundred sixteen".