199634 has 4 divisors (see below), whose sum is σ = 299454. Its totient is φ = 99816.

The previous prime is 199621. The next prime is 199637. The reversal of 199634 is 436991.

199634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 436991 = 251 ⋅1741.

It can be written as a sum of positive squares in only one way, i.e., 157609 + 42025 = 397^2 + 205^2 .

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 199634.

It is not an unprimeable number, because it can be changed into a prime (199637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49907 + ... + 49910.

2¹⁹⁹⁶³⁴ is an apocalyptic number.

199634 is a deficient number, since it is larger than the sum of its proper divisors (99820).

199634 is an equidigital number, since it uses as much as digits as its factorization.

199634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99819.

The product of its digits is 5832, while the sum is 32.

The square root of 199634 is about 446.8042076794. The cubic root of 199634 is about 58.4446599652. Note that the first 3 decimals are identical.

The spelling of 199634 in words is "one hundred ninety-nine thousand, six hundred thirty-four".