199649 has 4 divisors (see below), whose sum is σ = 204336. Its totient is φ = 194964.

The previous prime is 199637. The next prime is 199657. The reversal of 199649 is 946991.

199649 = 46² + 47² + ... + 88².

199649 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 946991 = 331 ⋅2861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199649 is a prime.

It is a plaindrome in base 11.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (199669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2279 + ... + 2364.

It is an arithmetic number, because the mean of its divisors is an integer number (51084).

2¹⁹⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

199649 is a deficient number, since it is larger than the sum of its proper divisors (4687).

199649 is an equidigital number, since it uses as much as digits as its factorization.

199649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686.

The product of its digits is 17496, while the sum is 38.

The square root of 199649 is about 446.8209932400. The cubic root of 199649 is about 58.4461237237.

It can be divided in two parts, 199 and 649, that added together give a palindrome (848).

The spelling of 199649 in words is "one hundred ninety-nine thousand, six hundred forty-nine".