1216589 has 8 divisors (see below), whose sum is σ = 1397280. Its totient is φ = 1047600.

The previous prime is 1216583. The next prime is 1216591. The reversal of 1216589 is 9856121.

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 1216589 - 2²⁰ = 168013 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216583) 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, 2702 + ... + 3119.

It is an arithmetic number, because the mean of its divisors is an integer number (174660).

2^1216589 is an apocalyptic number.

1216589 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1216589 is a deficient number, since it is larger than the sum of its proper divisors (180691).

1216589 is a wasteful number, since it uses less digits than its factorization.

1216589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851.

The product of its digits is 4320, while the sum is 32.

The square root of 1216589 is about 1102.9909337796. The cubic root of 1216589 is about 106.7532965945.

The spelling of 1216589 in words is "one million, two hundred sixteen thousand, five hundred eighty-nine".