19689938 has 8 divisors (see below), whose sum is σ = 29568240. Its totient is φ = 9833860.

The previous prime is 19689937. The next prime is 19689959. The reversal of 19689938 is 83998691.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19689938.

It is not an unprimeable number, because it can be changed into a prime (19689931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3128 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (3696030).

Almost surely, 2^19689938 is an apocalyptic number.

19689938 is a deficient number, since it is larger than the sum of its proper divisors (9878302).

19689938 is a wasteful number, since it uses less digits than its factorization.

19689938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112.

The product of its digits is 839808, while the sum is 53.

The square root of 19689938 is about 4437.3345602963. The cubic root of 19689938 is about 270.0317200959.

The spelling of 19689938 in words is "nineteen million, six hundred eighty-nine thousand, nine hundred thirty-eight".