1198841987 has 6 divisors (see below), whose sum is σ = 1394571348. Its totient is φ = 1027578804.

The previous prime is 1198841971. The next prime is 1198841999. The reversal of 1198841987 is 7891488911.

It is not a de Polignac number, because 1198841987 - 2⁴ = 1198841971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198841947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12233033 + ... + 12233130.

It is an arithmetic number, because the mean of its divisors is an integer number (232428558).

Almost surely, 2^1198841987 is an apocalyptic number.

1198841987 is a deficient number, since it is larger than the sum of its proper divisors (195729361).

1198841987 is an equidigital number, since it uses as much as digits as its factorization.

1198841987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24466177 (or 24466170 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 56.

The square root of 1198841987 is about 34624.2976390858. The cubic root of 1198841987 is about 1062.3166334913.

The spelling of 1198841987 in words is "one billion, one hundred ninety-eight million, eight hundred forty-one thousand, nine hundred eighty-seven".