199442 has 4 divisors (see below), whose sum is σ = 299166. Its totient is φ = 99720.

The previous prime is 199429. The next prime is 199447. The reversal of 199442 is 244991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244991 = 409 ⋅599.

It can be written as a sum of positive squares in only one way, i.e., 177241 + 22201 = 421^2 + 149^2 .

It is a super-2 number, since 2×199442² = 79554222728, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (199447) by changing a digit.

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 as a sum of consecutive naturals, namely, 49859 + ... + 49862.

2¹⁹⁹⁴⁴² is an apocalyptic number.

199442 is a deficient number, since it is larger than the sum of its proper divisors (99724).

199442 is an equidigital number, since it uses as much as digits as its factorization.

199442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99723.

The product of its digits is 2592, while the sum is 29.

The square root of 199442 is about 446.5892967817. The cubic root of 199442 is about 58.4259173761.

The spelling of 199442 in words is "one hundred ninety-nine thousand, four hundred forty-two".