11721589 has 8 divisors (see below), whose sum is σ = 13004640. Its totient is φ = 10474800.

The previous prime is 11721587. The next prime is 11721607. The reversal of 11721589 is 98512711.

It is a happy number.

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 11721589 - 2¹ = 11721587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721587) 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, 8382 + ... + 9679.

It is an arithmetic number, because the mean of its divisors is an integer number (1625580).

Almost surely, 2^11721589 is an apocalyptic number.

It is an amenable number.

11721589 is a deficient number, since it is larger than the sum of its proper divisors (1283051).

11721589 is a wasteful number, since it uses less digits than its factorization.

11721589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18131.

The product of its digits is 5040, while the sum is 34.

The square root of 11721589 is about 3423.6806217870. The cubic root of 11721589 is about 227.1584150421.

The spelling of 11721589 in words is "eleven million, seven hundred twenty-one thousand, five hundred eighty-nine".