19684129 has 2 divisors, whose sum is σ = 19684130. Its totient is φ = 19684128.

The previous prime is 19684121. The next prime is 19684139. The reversal of 19684129 is 92148691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 5053504 = 3825^2 + 2248^2 .

It is an emirp because it is prime and its reverse (92148691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19684129 - 2³ = 19684121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19684091 and 19684100.

It is not a weakly prime, because it can be changed into another prime (19684121) 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 as a sum of consecutive naturals, namely, 9842064 + 9842065.

It is an arithmetic number, because the mean of its divisors is an integer number (9842065).

Almost surely, 2^19684129 is an apocalyptic number.

It is an amenable number.

19684129 is a deficient number, since it is larger than the sum of its proper divisors (1).

19684129 is an equidigital number, since it uses as much as digits as its factorization.

19684129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 19684129 is about 4436.6799523968. The cubic root of 19684129 is about 270.0051622241.

The spelling of 19684129 in words is "nineteen million, six hundred eighty-four thousand, one hundred twenty-nine".