19986938 has 8 divisors (see below), whose sum is σ = 30618432. Its totient is φ = 9780796.

The previous prime is 19986929. The next prime is 19986943. The reversal of 19986938 is 83968991.

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 19986938.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106220 + ... + 106407.

It is an arithmetic number, because the mean of its divisors is an integer number (3827304).

Almost surely, 2^19986938 is an apocalyptic number.

19986938 is a deficient number, since it is larger than the sum of its proper divisors (10631494).

19986938 is a wasteful number, since it uses less digits than its factorization.

19986938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212676.

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

The square root of 19986938 is about 4470.6753404827. The cubic root of 19986938 is about 271.3826559188.

The spelling of 19986938 in words is "nineteen million, nine hundred eighty-six thousand, nine hundred thirty-eight".