1189988 has 12 divisors (see below), whose sum is σ = 2117052. Its totient is φ = 585120.

The previous prime is 1189967. The next prime is 1189999. The reversal of 1189988 is 8899811.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 1036324 = 392^2 + 1018^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2195 + ... + 2682.

It is an arithmetic number, because the mean of its divisors is an integer number (176421).

2^1189988 is an apocalyptic number.

It is an amenable number.

1189988 is a deficient number, since it is larger than the sum of its proper divisors (927064).

1189988 is a wasteful number, since it uses less digits than its factorization.

1189988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4940 counting only the distinct ones).

The product of its digits is 41472, while the sum is 44.

The square root of 1189988 is about 1090.8657112587. The cubic root of 1189988 is about 105.9694940101.

The spelling of 1189988 in words is "one million, one hundred eighty-nine thousand, nine hundred eighty-eight".