15988 has 12 divisors (see below), whose sum is σ = 32032. Its totient is φ = 6840.
The previous prime is 15973. The next prime is 15991. The reversal of 15988 is 88951.
15988 is an admirable number.
It is a super-2 number, since 2×159882 = 511232288, which contains 22 as substring.
It is a nialpdrome in base 7.
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, 258 + ... + 313.
215988 is an apocalyptic number.
It is an amenable number.
15988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
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 (16016).
15988 is a wasteful number, since it uses less digits than its factorization.
15988 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 582 (or 580 counting only the distinct ones).
The product of its digits is 2880, while the sum is 31.
The square root of 15988 is about 126.4436633446. The cubic root of 15988 is about 25.1921198171.
The spelling of 15988 in words is "fifteen thousand, nine hundred eighty-eight".
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