18966368 has 36 divisors (see below), whose sum is σ = 38238228. Its totient is φ = 9260160.

The previous prime is 18966361. The next prime is 18966371. The reversal of 18966368 is 86366981.

It is a super-2 number, since 2×18966368² = 719446230222848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18966361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89783 + ... + 89993.

It is an arithmetic number, because the mean of its divisors is an integer number (1062173).

Almost surely, 2^18966368 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 18966368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19119114).

18966368 is an abundant number, since it is smaller than the sum of its proper divisors (19271860).

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

18966368 is an equidigital number, since it uses as much as digits as its factorization.

18966368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 266 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 18966368 is about 4355.0393798449. The cubic root of 18966368 is about 266.6826268225.

The spelling of 18966368 in words is "eighteen million, nine hundred sixty-six thousand, three hundred sixty-eight".