199243479 has 8 divisors (see below), whose sum is σ = 274227712. Its totient is φ = 128544120.

The previous prime is 199243459. The next prime is 199243487. The reversal of 199243479 is 974342991.

It is a happy number.

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

It is not a de Polignac number, because 199243479 - 2⁷ = 199243351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199243439) 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, 1071109 + ... + 1071294.

It is an arithmetic number, because the mean of its divisors is an integer number (34278464).

Almost surely, 2^199243479 is an apocalyptic number.

199243479 is a deficient number, since it is larger than the sum of its proper divisors (74984233).

199243479 is a wasteful number, since it uses less digits than its factorization.

199243479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142437.

The product of its digits is 489888, while the sum is 48.

The square root of 199243479 is about 14115.3632259322. The cubic root of 199243479 is about 584.0652556952.

The spelling of 199243479 in words is "one hundred ninety-nine million, two hundred forty-three thousand, four hundred seventy-nine".