199641 has 8 divisors (see below), whose sum is σ = 286720. Its totient is φ = 122832.

The previous prime is 199637. The next prime is 199657. The reversal of 199641 is 146991.

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

It is not a de Polignac number, because 199641 - 2² = 199637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 199599 and 199608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199601) 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, 2521 + ... + 2598.

It is an arithmetic number, because the mean of its divisors is an integer number (35840).

2¹⁹⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

199641 is a deficient number, since it is larger than the sum of its proper divisors (87079).

199641 is a wasteful number, since it uses less digits than its factorization.

199641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135.

The product of its digits is 1944, while the sum is 30.

The square root of 199641 is about 446.8120410195. The cubic root of 199641 is about 58.4453430616.

Subtracting from 199641 its reverse (146991), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 199641 in words is "one hundred ninety-nine thousand, six hundred forty-one".