1198351918 has 4 divisors (see below), whose sum is σ = 1797527880. Its totient is φ = 599175958.

The previous prime is 1198351859. The next prime is 1198351919. The reversal of 1198351918 is 8191538911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8191538911 = 29 ⋅282466859.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198351919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 299587978 + ... + 299587981.

It is an arithmetic number, because the mean of its divisors is an integer number (449381970).

Almost surely, 2^1198351918 is an apocalyptic number.

1198351918 is a deficient number, since it is larger than the sum of its proper divisors (599175962).

1198351918 is an equidigital number, since it uses as much as digits as its factorization.

1198351918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599175961.

The product of its digits is 77760, while the sum is 46.

The square root of 1198351918 is about 34617.2199634806. The cubic root of 1198351918 is about 1062.1718606158.

The spelling of 1198351918 in words is "one billion, one hundred ninety-eight million, three hundred fifty-one thousand, nine hundred eighteen".