1198869387 has 4 divisors (see below), whose sum is σ = 1598492520. Its totient is φ = 799246256.

The previous prime is 1198869383. The next prime is 1198869407. The reversal of 1198869387 is 7839688911.

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 1198869387 - 2² = 1198869383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1198869387.

It is not an unprimeable number, because it can be changed into a prime (1198869383) 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 in 3 ways as a sum of consecutive naturals, for example, 199811562 + ... + 199811567.

It is an arithmetic number, because the mean of its divisors is an integer number (399623130).

Almost surely, 2^1198869387 is an apocalyptic number.

1198869387 is a deficient number, since it is larger than the sum of its proper divisors (399623133).

1198869387 is an equidigital number, since it uses as much as digits as its factorization.

1198869387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399623132.

The product of its digits is 5225472, while the sum is 60.

The square root of 1198869387 is about 34624.6933127212. The cubic root of 1198869387 is about 1062.3247266497.

The spelling of 1198869387 in words is "one billion, one hundred ninety-eight million, eight hundred sixty-nine thousand, three hundred eighty-seven".