18867966 has 32 divisors (see below), whose sum is σ = 41223168. Its totient is φ = 5722080.

The previous prime is 18867923. The next prime is 18867967. The reversal of 18867966 is 66976881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18867967) 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, 3835 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (1288224).

Almost surely, 2^18867966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18867966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20611584).

18867966 is an abundant number, since it is smaller than the sum of its proper divisors (22355202).

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

18867966 is a wasteful number, since it uses less digits than its factorization.

18867966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496.

The product of its digits is 870912, while the sum is 51.

The square root of 18867966 is about 4343.7272013790. The cubic root of 18867966 is about 266.2206227368.

The spelling of 18867966 in words is "eighteen million, eight hundred sixty-seven thousand, nine hundred sixty-six".