199988 has 18 divisors (see below), whose sum is σ = 373926. Its totient is φ = 93568.

The previous prime is 199967. The next prime is 199999. The reversal of 199988 is 889991.

It can be written as a sum of positive squares in 3 ways, for example, as 128164 + 71824 = 358^2 + 268^2 .

Its product of digits (46656) is a multiple of the sum of its prime divisors (192).

It is a congruent number.

It is an unprimeable number.

199988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1070 + ... + 1242.

2¹⁹⁹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

199988 is a deficient number, since it is larger than the sum of its proper divisors (173938).

199988 is a wasteful number, since it uses less digits than its factorization.

199988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 192 counting only the distinct ones).

The product of its digits is 46656, while the sum is 44.

The square root of 199988 is about 447.2001788908. The cubic root of 199988 is about 58.4791851338.

The spelling of 199988 in words is "one hundred ninety-nine thousand, nine hundred eighty-eight".