1189645 has 4 divisors (see below), whose sum is σ = 1427580. Its totient is φ = 951712.

The previous prime is 1189637. The next prime is 1189649. The reversal of 1189645 is 5469811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5469811 = 797 ⋅6863.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 346921 = 918^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189645 - 2³ = 1189637 is a prime.

It is a super-3 number, since 3×1189645³ = 5050953910093533375, which contains 333 as substring.

It is an Ulam number.

1189645 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1189645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118960 + ... + 118969.

It is an arithmetic number, because the mean of its divisors is an integer number (356895).

2^1189645 is an apocalyptic number.

It is an amenable number.

1189645 is a deficient number, since it is larger than the sum of its proper divisors (237935).

1189645 is an equidigital number, since it uses as much as digits as its factorization.

1189645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237934.

The product of its digits is 8640, while the sum is 34.

The square root of 1189645 is about 1090.7084853434. The cubic root of 1189645 is about 105.9593115463.

The spelling of 1189645 in words is "one million, one hundred eighty-nine thousand, six hundred forty-five".