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15998 = 219421
BaseRepresentation
bin11111001111110
3210221112
43321332
51002443
6202022
764433
oct37176
923845
1015998
1111024
129312
137388
145b8a
154b18
hex3e7e

15998 has 8 divisors (see below), whose sum is σ = 25320. Its totient is φ = 7560.

The previous prime is 15991. The next prime is 16001. The reversal of 15998 is 89951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15991) by changing a digit.

15998 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173 + ... + 248.

It is an arithmetic number, because the mean of its divisors is an integer number (3165).

215998 is an apocalyptic number.

15998 is a deficient number, since it is larger than the sum of its proper divisors (9322).

15998 is a wasteful number, since it uses less digits than its factorization.

15998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442.

The product of its digits is 3240, while the sum is 32.

The square root of 15998 is about 126.4832004655. The cubic root of 15998 is about 25.1973710199.

The spelling of 15998 in words is "fifteen thousand, nine hundred ninety-eight".

Divisors: 1 2 19 38 421 842 7999 15998