1198139899 has 8 divisors (see below), whose sum is σ = 1311241392. Its totient is φ = 1085735040.

The previous prime is 1198139879. The next prime is 1198139909. The reversal of 1198139899 is 9989318911.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1198139899 - 2⁹ = 1198139387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198139849) 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, 170554 + ... + 177439.

It is an arithmetic number, because the mean of its divisors is an integer number (163905174).

Almost surely, 2^1198139899 is an apocalyptic number.

1198139899 is a deficient number, since it is larger than the sum of its proper divisors (113101493).

1198139899 is a wasteful number, since it uses less digits than its factorization.

1198139899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348317.

The product of its digits is 1259712, while the sum is 58.

The square root of 1198139899 is about 34614.1574937192. The cubic root of 1198139899 is about 1062.1092151622.

The spelling of 1198139899 in words is "one billion, one hundred ninety-eight million, one hundred thirty-nine thousand, eight hundred ninety-nine".