15609989 has 8 divisors (see below), whose sum is σ = 16201152. Its totient is φ = 15029280.

The previous prime is 15609949. The next prime is 15610027. The reversal of 15609989 is 98990651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-15609989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15609929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497 + ... + 5609.

It is an arithmetic number, because the mean of its divisors is an integer number (2025144).

Almost surely, 2^15609989 is an apocalyptic number.

It is an amenable number.

15609989 is a deficient number, since it is larger than the sum of its proper divisors (591163).

15609989 is an equidigital number, since it uses as much as digits as its factorization.

15609989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5227.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 15609989 is about 3950.9478609569. The cubic root of 15609989 is about 249.9199156821.

The spelling of 15609989 in words is "fifteen million, six hundred nine thousand, nine hundred eighty-nine".