19986079 has 2 divisors, whose sum is σ = 19986080. Its totient is φ = 19986078.

The previous prime is 19986077. The next prime is 19986091. The reversal of 19986079 is 97068991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19986079 - 2¹ = 19986077 is a prime.

Together with 19986077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19986077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9993039 + 9993040.

It is an arithmetic number, because the mean of its divisors is an integer number (9993040).

Almost surely, 2^19986079 is an apocalyptic number.

19986079 is a deficient number, since it is larger than the sum of its proper divisors (1).

19986079 is an equidigital number, since it uses as much as digits as its factorization.

19986079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19986079 is about 4470.5792689539. The cubic root of 19986079 is about 271.3787680289.

The spelling of 19986079 in words is "nineteen million, nine hundred eighty-six thousand, seventy-nine".