1188396398 has 24 divisors (see below), whose sum is σ = 2088193296. Its totient is φ = 496880640.

The previous prime is 1188396389. The next prime is 1188396413. The reversal of 1188396398 is 8936938811.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1715 + ... + 48782.

It is an arithmetic number, because the mean of its divisors is an integer number (87008054).

Almost surely, 2^1188396398 is an apocalyptic number.

1188396398 is a deficient number, since it is larger than the sum of its proper divisors (899796898).

1188396398 is an equidigital number, since it uses as much as digits as its factorization.

1188396398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50588 (or 50547 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 56.

The square root of 1188396398 is about 34473.1257358540. The cubic root of 1188396398 is about 1059.2222840490. Note that the first 4 decimals are identical.

The spelling of 1188396398 in words is "one billion, one hundred eighty-eight million, three hundred ninety-six thousand, three hundred ninety-eight".