1189681 has 8 divisors (see below), whose sum is σ = 1237280. Its totient is φ = 1143072.

The previous prime is 1189673. The next prime is 1189703. The reversal of 1189681 is 1869811.

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

It is a cyclic number.

It is not a de Polignac number, because 1189681 - 2³ = 1189673 is a prime.

It is a super-2 number, since 2×1189681² = 2830681763522, which contains 22 as substring.

It is a Duffinian number.

1189681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1189621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2950 + ... + 3328.

It is an arithmetic number, because the mean of its divisors is an integer number (154660).

2^1189681 is an apocalyptic number.

It is an amenable number.

1189681 is a deficient number, since it is larger than the sum of its proper divisors (47599).

1189681 is an equidigital number, since it uses as much as digits as its factorization.

1189681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495.

The product of its digits is 3456, while the sum is 34.

The square root of 1189681 is about 1090.7249882532. The cubic root of 1189681 is about 105.9603803516.

The spelling of 1189681 in words is "one million, one hundred eighty-nine thousand, six hundred eighty-one".