1198799899 has 4 divisors (see below), whose sum is σ = 1307781720. Its totient is φ = 1089818080.

The previous prime is 1198799891. The next prime is 1198799909. The reversal of 1198799899 is 9989978911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1198799899 - 2³ = 1198799891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198799891) 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, 54490894 + ... + 54490915.

It is an arithmetic number, because the mean of its divisors is an integer number (326945430).

Almost surely, 2^1198799899 is an apocalyptic number.

1198799899 is a deficient number, since it is larger than the sum of its proper divisors (108981821).

1198799899 is a wasteful number, since it uses less digits than its factorization.

1198799899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108981820.

The product of its digits is 26453952, while the sum is 70.

The square root of 1198799899 is about 34623.6898524695. The cubic root of 1198799899 is about 1062.3042016874.

The spelling of 1198799899 in words is "one billion, one hundred ninety-eight million, seven hundred ninety-nine thousand, eight hundred ninety-nine".