1089643 has 4 divisors (see below), whose sum is σ = 1107568. Its totient is φ = 1071720.

The previous prime is 1089629. The next prime is 1089653. The reversal of 1089643 is 3469801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3469801 = 809 ⋅4289.

It is a cyclic number.

It is not a de Polignac number, because 1089643 - 2⁵ = 1089611 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1089653) 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, 8871 + ... + 8992.

It is an arithmetic number, because the mean of its divisors is an integer number (276892).

2^1089643 is an apocalyptic number.

1089643 is a deficient number, since it is larger than the sum of its proper divisors (17925).

1089643 is an equidigital number, since it uses as much as digits as its factorization.

1089643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17924.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1089643 is about 1043.8596648975. The cubic root of 1089643 is about 102.9030098382.

The spelling of 1089643 in words is "one million, eighty-nine thousand, six hundred forty-three".