19798679 has 2 divisors, whose sum is σ = 19798680. Its totient is φ = 19798678.

The previous prime is 19798643. The next prime is 19798687. The reversal of 19798679 is 97689791.

It is a strong prime.

It is an emirp because it is prime and its reverse (97689791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19798679 - 2²⁴ = 3021463 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19798579) by changing a digit.

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, 9899339 + 9899340.

It is an arithmetic number, because the mean of its divisors is an integer number (9899340).

Almost surely, 2^19798679 is an apocalyptic number.

19798679 is a deficient number, since it is larger than the sum of its proper divisors (1).

19798679 is an equidigital number, since it uses as much as digits as its factorization.

19798679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 19798679 is about 4449.5706534451. The cubic root of 19798679 is about 270.5279063463.

The spelling of 19798679 in words is "nineteen million, seven hundred ninety-eight thousand, six hundred seventy-nine".