18669812 has 48 divisors (see below), whose sum is σ = 39072768. Its totient is φ = 7637760.

The previous prime is 18669811. The next prime is 18669829. The reversal of 18669812 is 21896681.

It is a self number, because there is not a number n which added to its sum of digits gives 18669812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669811) 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, 118838 + ... + 118994.

It is an arithmetic number, because the mean of its divisors is an integer number (814016).

Almost surely, 2^18669812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18669812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19536384).

18669812 is an abundant number, since it is smaller than the sum of its proper divisors (20402956).

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

18669812 is a wasteful number, since it uses less digits than its factorization.

18669812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 334 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 18669812 is about 4320.8577852089. The cubic root of 18669812 is about 265.2853790483.

The spelling of 18669812 in words is "eighteen million, six hundred sixty-nine thousand, eight hundred twelve".