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18378 = 2321021
BaseRepresentation
bin100011111001010
3221012200
410133022
51042003
6221030
7104403
oct43712
927180
1018378
1112898
12a776
138499
1469aa
1556a3
hex47ca

18378 has 12 divisors (see below), whose sum is σ = 39858. Its totient is φ = 6120.

The previous prime is 18371. The next prime is 18379. The reversal of 18378 is 87381.

18378 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 15129 + 3249 = 123^2 + 57^2 .

It is an Ulam number.

It is a plaindrome in base 14.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (18371) 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, 493 + ... + 528.

218378 is an apocalyptic number.

18378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18378 is an abundant number, since it is smaller than the sum of its proper divisors (21480).

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

18378 is a wasteful number, since it uses less digits than its factorization.

18378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1026 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18378 is about 135.5654823323. The cubic root of 18378 is about 26.3895964517.

The spelling of 18378 in words is "eighteen thousand, three hundred seventy-eight".

Divisors: 1 2 3 6 9 18 1021 2042 3063 6126 9189 18378