18619216 has 120 divisors (see below), whose sum is σ = 48854016. Its totient is φ = 6773760.

The previous prime is 18619193. The next prime is 18619219. The reversal of 18619216 is 61291681.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18619219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146545 + ... + 146671.

Almost surely, 2^18619216 is an apocalyptic number.

18619216 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 18619216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24427008).

18619216 is an abundant number, since it is smaller than the sum of its proper divisors (30234800).

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

18619216 is a wasteful number, since it uses less digits than its factorization.

18619216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 164 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The square root of 18619216 is about 4314.9989571262. The cubic root of 18619216 is about 265.0455172793.

The spelling of 18619216 in words is "eighteen million, six hundred nineteen thousand, two hundred sixteen".