18930 has 16 divisors (see below), whose sum is σ = 45504. Its totient is φ = 5040.

The previous prime is 18919. The next prime is 18947. The reversal of 18930 is 3981.

18930 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18897 and 18906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286 + ... + 345.

It is an arithmetic number, because the mean of its divisors is an integer number (2844).

2¹⁸⁹³⁰ is an apocalyptic number.

18930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18930 is an abundant number, since it is smaller than the sum of its proper divisors (26574).

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 (22752).

18930 is a wasteful number, since it uses less digits than its factorization.

18930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 18930 is about 137.5863365309. The cubic root of 18930 is about 26.6512063162.

The spelling of 18930 in words is "eighteen thousand, nine hundred thirty".