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19988 = 2219263
BaseRepresentation
bin100111000010100
31000102022
410320110
51114423
6232312
7112163
oct47024
930368
1019988
1114021
12b698
139137
1473da
155dc8
hex4e14

19988 has 12 divisors (see below), whose sum is σ = 36960. Its totient is φ = 9432.

The previous prime is 19979. The next prime is 19991. The reversal of 19988 is 88991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 207.

It is an arithmetic number, because the mean of its divisors is an integer number (3080).

219988 is an apocalyptic number.

It is an amenable number.

19988 is a deficient number, since it is larger than the sum of its proper divisors (16972).

19988 is a wasteful number, since it uses less digits than its factorization.

19988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 284 counting only the distinct ones).

The product of its digits is 5184, while the sum is 35.

The square root of 19988 is about 141.3789234646. The cubic root of 19988 is about 27.1387462446.

The spelling of 19988 in words is "nineteen thousand, nine hundred eighty-eight".

Divisors: 1 2 4 19 38 76 263 526 1052 4997 9994 19988