19660039 has 16 divisors (see below), whose sum is σ = 23063040. Its totient is φ = 16411680.

The previous prime is 19660037. The next prime is 19660051. The reversal of 19660039 is 93006691.

It is a cyclic number.

It is not a de Polignac number, because 19660039 - 2¹ = 19660037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19659986 and 19660013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19660031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74622 + ... + 74884.

It is an arithmetic number, because the mean of its divisors is an integer number (1441440).

Almost surely, 2^19660039 is an apocalyptic number.

19660039 is a deficient number, since it is larger than the sum of its proper divisors (3403001).

19660039 is a wasteful number, since it uses less digits than its factorization.

19660039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 19660039 is about 4433.9642533516. The cubic root of 19660039 is about 269.8949705803.

The spelling of 19660039 in words is "nineteen million, six hundred sixty thousand, thirty-nine".