19679138 has 4 divisors (see below), whose sum is σ = 29518710. Its totient is φ = 9839568.

The previous prime is 19679129. The next prime is 19679159. The reversal of 19679138 is 83197691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19298449 + 380689 = 4393^2 + 617^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4919783 + ... + 4919786.

Almost surely, 2^19679138 is an apocalyptic number.

19679138 is a deficient number, since it is larger than the sum of its proper divisors (9839572).

19679138 is an equidigital number, since it uses as much as digits as its factorization.

19679138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9839571.

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

The square root of 19679138 is about 4436.1174465967. The cubic root of 19679138 is about 269.9823399515.

The spelling of 19679138 in words is "nineteen million, six hundred seventy-nine thousand, one hundred thirty-eight".