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18886 = 271971
BaseRepresentation
bin100100111000110
3221220111
410213012
51101021
6223234
7106030
oct44706
927814
1018886
111320a
12ab1a
13879a
146c50
1558e1
hex49c6

18886 has 16 divisors (see below), whose sum is σ = 34560. Its totient is φ = 7560.

The previous prime is 18869. The next prime is 18899. The reversal of 18886 is 68881.

18886 = T50 + T51 + ... + T61.

It is a congruent number.

It is an unprimeable number.

18886 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231 + ... + 301.

It is an arithmetic number, because the mean of its divisors is an integer number (2160).

218886 is an apocalyptic number.

18886 is a deficient number, since it is larger than the sum of its proper divisors (15674).

18886 is a wasteful number, since it uses less digits than its factorization.

18886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99.

The product of its digits is 3072, while the sum is 31.

The square root of 18886 is about 137.4263439083. The cubic root of 18886 is about 26.6305413610.

The spelling of 18886 in words is "eighteen thousand, eight hundred eighty-six".

Divisors: 1 2 7 14 19 38 71 133 142 266 497 994 1349 2698 9443 18886