199988479 has 2 divisors, whose sum is σ = 199988480. Its totient is φ = 199988478.

The previous prime is 199988413. The next prime is 199988483. The reversal of 199988479 is 974889991.

It is a strong prime.

It is an emirp because it is prime and its reverse (974889991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199988479 - 2⁷ = 199988351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199988479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199988179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99994239 + 99994240.

It is an arithmetic number, because the mean of its divisors is an integer number (99994240).

Almost surely, 2^199988479 is an apocalyptic number.

199988479 is a deficient number, since it is larger than the sum of its proper divisors (1).

199988479 is an equidigital number, since it uses as much as digits as its factorization.

199988479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 64.

The square root of 199988479 is about 14141.7282890034. The cubic root of 199988479 is about 584.7923182242.

The spelling of 199988479 in words is "one hundred ninety-nine million, nine hundred eighty-eight thousand, four hundred seventy-nine".