19748879 has 2 divisors, whose sum is σ = 19748880. Its totient is φ = 19748878.

The previous prime is 19748867. The next prime is 19748887. The reversal of 19748879 is 97884791.

It is a strong prime.

It is an emirp because it is prime and its reverse (97884791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19748879 - 2²⁴ = 2971663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19748879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19748819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9874439 + 9874440.

It is an arithmetic number, because the mean of its divisors is an integer number (9874440).

Almost surely, 2^19748879 is an apocalyptic number.

19748879 is a deficient number, since it is larger than the sum of its proper divisors (1).

19748879 is an equidigital number, since it uses as much as digits as its factorization.

19748879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 19748879 is about 4443.9710845144. The cubic root of 19748879 is about 270.3008945467.

The spelling of 19748879 in words is "nineteen million, seven hundred forty-eight thousand, eight hundred seventy-nine".