1189986 has 32 divisors (see below), whose sum is σ = 2816640. Its totient is φ = 327936.

The previous prime is 1189967. The next prime is 1189999. The reversal of 1189986 is 6899811.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 730 + ... + 1706.

It is an arithmetic number, because the mean of its divisors is an integer number (88020).

2^1189986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1189986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1408320).

1189986 is an abundant number, since it is smaller than the sum of its proper divisors (1626654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1189986 is a wasteful number, since it uses less digits than its factorization.

1189986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its digits is 31104, while the sum is 42.

The square root of 1189986 is about 1090.8647945552. The cubic root of 1189986 is about 105.9694346428.

The spelling of 1189986 in words is "one million, one hundred eighty-nine thousand, nine hundred eighty-six".