1189806 has 8 divisors (see below), whose sum is σ = 2379624. Its totient is φ = 396600.

The previous prime is 1189801. The next prime is 1189807. The reversal of 1189806 is 6089811.

1189806 = 164² + 165² + ... + 199².

It is a sphenic number, since it is the product of 3 distinct primes.

1189806 is an admirable number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99145 + ... + 99156.

It is an arithmetic number, because the mean of its divisors is an integer number (297453).

2^1189806 is an apocalyptic number.

1189806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1189806 is a wasteful number, since it uses less digits than its factorization.

1189806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198306.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1189806 is about 1090.7822880850. The cubic root of 1189806 is about 105.9640913138.

The spelling of 1189806 in words is "one million, one hundred eighty-nine thousand, eight hundred six".