15689609 has 8 divisors (see below), whose sum is σ = 17479560. Its totient is φ = 13982976.

The previous prime is 15689603. The next prime is 15689621. The reversal of 15689609 is 90698651.

It can be written as a sum of positive squares in 4 ways, for example, as 4963984 + 10725625 = 2228^2 + 3275^2 .

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 15689609 - 2¹⁶ = 15624073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15689609.

It is not an unprimeable number, because it can be changed into a prime (15689603) 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, 20432 + ... + 21185.

It is an arithmetic number, because the mean of its divisors is an integer number (2184945).

Almost surely, 2^15689609 is an apocalyptic number.

It is an amenable number.

15689609 is a deficient number, since it is larger than the sum of its proper divisors (1789951).

15689609 is a wasteful number, since it uses less digits than its factorization.

15689609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41659.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 15689609 is about 3961.0111082904. The cubic root of 15689609 is about 250.3441074762.

The spelling of 15689609 in words is "fifteen million, six hundred eighty-nine thousand, six hundred nine".