199769 has 4 divisors (see below), whose sum is σ = 201744. Its totient is φ = 197796.

The previous prime is 199753. The next prime is 199777. The reversal of 199769 is 967991.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 199769 - 2⁴ = 199753 is a prime.

It is a super-2 number, since 2×199769² = 79815306722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199729) 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, 827 + ... + 1040.

It is an arithmetic number, because the mean of its divisors is an integer number (50436).

2¹⁹⁹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

199769 is a deficient number, since it is larger than the sum of its proper divisors (1975).

199769 is a wasteful number, since it uses less digits than its factorization.

199769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974.

The product of its digits is 30618, while the sum is 41.

The square root of 199769 is about 446.9552550312. The cubic root of 199769 is about 58.4578311539.

The spelling of 199769 in words is "one hundred ninety-nine thousand, seven hundred sixty-nine".