199445 has 8 divisors (see below), whose sum is σ = 242136. Its totient is φ = 157696.

The previous prime is 199429. The next prime is 199447. The reversal of 199445 is 544991.

It can be written as a sum of positive squares in 4 ways, for example, as 529 + 198916 = 23^2 + 446^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 199445 - 2⁴ = 199429 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389 + ... + 741.

It is an arithmetic number, because the mean of its divisors is an integer number (30267).

2¹⁹⁹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

199445 is a deficient number, since it is larger than the sum of its proper divisors (42691).

199445 is a wasteful number, since it uses less digits than its factorization.

199445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471.

The product of its digits is 6480, while the sum is 32.

The square root of 199445 is about 446.5926555599. The cubic root of 199445 is about 58.4262103216.

The spelling of 199445 in words is "one hundred ninety-nine thousand, four hundred forty-five".