19306139 has 2 divisors, whose sum is σ = 19306140. Its totient is φ = 19306138.

The previous prime is 19306129. The next prime is 19306213. The reversal of 19306139 is 93160391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19306139 - 2²⁰ = 18257563 is a prime.

It is not a weakly prime, because it can be changed into another prime (19306129) 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, 9653069 + 9653070.

It is an arithmetic number, because the mean of its divisors is an integer number (9653070).

Almost surely, 2^19306139 is an apocalyptic number.

19306139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19306139 is an equidigital number, since it uses as much as digits as its factorization.

19306139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 19306139 is about 4393.8751689141. The cubic root of 19306139 is about 268.2656968099.

The spelling of 19306139 in words is "nineteen million, three hundred six thousand, one hundred thirty-nine".