19986929 has 2 divisors, whose sum is σ = 19986930. Its totient is φ = 19986928.

The previous prime is 19986893. The next prime is 19986943. The reversal of 19986929 is 92968991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 1151329 = 4340^2 + 1073^2 .

It is an emirp because it is prime and its reverse (92968991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19986929 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19386929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9993464 + 9993465.

It is an arithmetic number, because the mean of its divisors is an integer number (9993465).

Almost surely, 2^19986929 is an apocalyptic number.

It is an amenable number.

19986929 is a deficient number, since it is larger than the sum of its proper divisors (1).

19986929 is an equidigital number, since it uses as much as digits as its factorization.

19986929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 53.

The square root of 19986929 is about 4470.6743339232. The cubic root of 19986929 is about 271.3826151848.

The spelling of 19986929 in words is "nineteen million, nine hundred eighty-six thousand, nine hundred twenty-nine".