199999469 has 4 divisors (see below), whose sum is σ = 200503644. Its totient is φ = 199495296.

The previous prime is 199999451. The next prime is 199999483. The reversal of 199999469 is 964999991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 964999991 = 53 ⋅18207547.

It can be written as a sum of positive squares in 2 ways, for example, as 117462244 + 82537225 = 10838^2 + 9085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199999469 is a prime.

It is a super-2 number, since 2×199999469² = 79999575200563922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999409) 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, 251492 + ... + 252285.

It is an arithmetic number, because the mean of its divisors is an integer number (50125911).

Almost surely, 2^199999469 is an apocalyptic number.

It is an amenable number.

199999469 is a deficient number, since it is larger than the sum of its proper divisors (504175).

199999469 is an equidigital number, since it uses as much as digits as its factorization.

199999469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504174.

The product of its digits is 12754584, while the sum is 65.

The square root of 199999469 is about 14142.1168500334. The cubic root of 199999469 is about 584.8030300910.

The spelling of 199999469 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred sixty-nine".