19688009 has 8 divisors (see below), whose sum is σ = 22608480. Its totient is φ = 16956000.

The previous prime is 19687991. The next prime is 19688029. The reversal of 19688009 is 90088691.

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 19688009 - 2⁸ = 19687753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19688029) 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, 46892 + ... + 47309.

It is an arithmetic number, because the mean of its divisors is an integer number (2826060).

Almost surely, 2^19688009 is an apocalyptic number.

19688009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19688009 is a deficient number, since it is larger than the sum of its proper divisors (2920471).

19688009 is a wasteful number, since it uses less digits than its factorization.

19688009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94231.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 19688009 is about 4437.1171947561. The cubic root of 19688009 is about 270.0229015782.

The spelling of 19688009 in words is "nineteen million, six hundred eighty-eight thousand, nine".