19639138 has 8 divisors (see below), whose sum is σ = 30085632. Its totient is φ = 9610596.

The previous prime is 19639121. The next prime is 19639157. The reversal of 19639138 is 83193691.

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 19639138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104370 + ... + 104557.

It is an arithmetic number, because the mean of its divisors is an integer number (3760704).

Almost surely, 2^19639138 is an apocalyptic number.

19639138 is a deficient number, since it is larger than the sum of its proper divisors (10446494).

19639138 is a wasteful number, since it uses less digits than its factorization.

19639138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208976.

The product of its digits is 34992, while the sum is 40.

The square root of 19639138 is about 4431.6067063764. The cubic root of 19639138 is about 269.7992929978.

The spelling of 19639138 in words is "nineteen million, six hundred thirty-nine thousand, one hundred thirty-eight".