19689216 has 72 divisors (see below), whose sum is σ = 54157824. Its totient is φ = 6343680.

The previous prime is 19689209. The next prime is 19689221. The reversal of 19689216 is 61298691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23395 + ... + 24221.

It is an arithmetic number, because the mean of its divisors is an integer number (752192).

Almost surely, 2^19689216 is an apocalyptic number.

19689216 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 19689216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27078912).

19689216 is an abundant number, since it is smaller than the sum of its proper divisors (34468608).

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

19689216 is an equidigital number, since it uses as much as digits as its factorization.

19689216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877 (or 863 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 19689216 is about 4437.2532044047. The cubic root of 19689216 is about 270.0284195051.

The spelling of 19689216 in words is "nineteen million, six hundred eighty-nine thousand, two hundred sixteen".