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18863 = 131451
BaseRepresentation
bin100100110101111
3221212122
410212233
51100423
6223155
7105665
oct44657
927778
1018863
1113199
12aabb
138780
146c35
1558c8
hex49af

18863 has 4 divisors (see below), whose sum is σ = 20328. Its totient is φ = 17400.

The previous prime is 18859. The next prime is 18869. The reversal of 18863 is 36881.

18863 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36881 = 132837.

It is a cyclic number.

It is not a de Polignac number, because 18863 - 22 = 18859 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9, base 12 and base 16.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713 + ... + 738.

It is an arithmetic number, because the mean of its divisors is an integer number (5082).

218863 is an apocalyptic number.

18863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18863 is a deficient number, since it is larger than the sum of its proper divisors (1465).

18863 is a wasteful number, since it uses less digits than its factorization.

18863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464.

The product of its digits is 1152, while the sum is 26.

The square root of 18863 is about 137.3426372253. The cubic root of 18863 is about 26.6197264494.

The spelling of 18863 in words is "eighteen thousand, eight hundred sixty-three".

Divisors: 1 13 1451 18863