1198341987 has 4 divisors (see below), whose sum is σ = 1597789320. Its totient is φ = 798894656.

The previous prime is 1198341959. The next prime is 1198342001. The reversal of 1198341987 is 7891438911.

It is a happy number.

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 1198341987 - 2⁶ = 1198341923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1198343987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199723662 + ... + 199723667.

It is an arithmetic number, because the mean of its divisors is an integer number (399447330).

Almost surely, 2^1198341987 is an apocalyptic number.

1198341987 is a deficient number, since it is larger than the sum of its proper divisors (399447333).

1198341987 is an equidigital number, since it uses as much as digits as its factorization.

1198341987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399447332.

The product of its digits is 435456, while the sum is 51.

The square root of 1198341987 is about 34617.0765230110. The cubic root of 1198341987 is about 1062.1689264588.

The spelling of 1198341987 in words is "one billion, one hundred ninety-eight million, three hundred forty-one thousand, nine hundred eighty-seven".