19716938 has 4 divisors (see below), whose sum is σ = 29575410. Its totient is φ = 9858468.

The previous prime is 19716929. The next prime is 19716943. The reversal of 19716938 is 83961791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83961791 = 331 ⋅253661.

It can be written as a sum of positive squares in only one way, i.e., 18722929 + 994009 = 4327^2 + 997^2 .

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 as a sum of consecutive naturals, namely, 4929233 + ... + 4929236.

Almost surely, 2^19716938 is an apocalyptic number.

19716938 is a deficient number, since it is larger than the sum of its proper divisors (9858472).

19716938 is an equidigital number, since it uses as much as digits as its factorization.

19716938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9858471.

The product of its digits is 81648, while the sum is 44.

The square root of 19716938 is about 4440.3758849899. The cubic root of 19716938 is about 270.1550915091.

The spelling of 19716938 in words is "nineteen million, seven hundred sixteen thousand, nine hundred thirty-eight".