19679399 has 4 divisors (see below), whose sum is σ = 19690536. Its totient is φ = 19668264.

The previous prime is 19679369. The next prime is 19679431. The reversal of 19679399 is 99397691.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19679399 - 2¹² = 19675303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19679399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19679339) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2264 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (4922634).

Almost surely, 2^19679399 is an apocalyptic number.

19679399 is a deficient number, since it is larger than the sum of its proper divisors (11137).

19679399 is an equidigital number, since it uses as much as digits as its factorization.

19679399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11136.

The product of its digits is 826686, while the sum is 53.

The square root of 19679399 is about 4436.1468641153. The cubic root of 19679399 is about 269.9835335180.

The spelling of 19679399 in words is "nineteen million, six hundred seventy-nine thousand, three hundred ninety-nine".