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18030 = 235601
BaseRepresentation
bin100011001101110
3220201210
410121232
51034110
6215250
7103365
oct43156
926653
1018030
1112601
12a526
13828c
1467dc
155520
hex466e

18030 has 16 divisors (see below), whose sum is σ = 43344. Its totient is φ = 4800.

The previous prime is 18013. The next prime is 18041. The reversal of 18030 is 3081.

18030 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a Curzon number.

It is a plaindrome in base 16.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 17997 and 18015.

It is a congruent number.

It is an unprimeable number.

18030 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271 + ... + 330.

It is an arithmetic number, because the mean of its divisors is an integer number (2709).

218030 is an apocalyptic number.

18030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18030 is an abundant number, since it is smaller than the sum of its proper divisors (25314).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21672).

18030 is a wasteful number, since it uses less digits than its factorization.

18030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 18030 is about 134.2758355029. The cubic root of 18030 is about 26.2219655353.

It can be divided in two parts, 180 and 30, that added together give a triangular number (210 = T20).

The spelling of 18030 in words is "eighteen thousand, thirty".