199745 has 16 divisors (see below), whose sum is σ = 295680. Its totient is φ = 126144.

The previous prime is 199741. The next prime is 199751. The reversal of 199745 is 547991.

It is a cyclic number.

It is not a de Polignac number, because 199745 - 2² = 199741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236 + ... + 674.

It is an arithmetic number, because the mean of its divisors is an integer number (18480).

2¹⁹⁹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

199745 is a deficient number, since it is larger than the sum of its proper divisors (95935).

199745 is a wasteful number, since it uses less digits than its factorization.

199745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its digits is 11340, while the sum is 35.

The square root of 199745 is about 446.9284058996. The cubic root of 199745 is about 58.4554900430.

The spelling of 199745 in words is "one hundred ninety-nine thousand, seven hundred forty-five".