19939123 has 2 divisors, whose sum is σ = 19939124. Its totient is φ = 19939122.

The previous prime is 19939121. The next prime is 19939163. The reversal of 19939123 is 32193991.

It is a weak prime.

It is an emirp because it is prime and its reverse (32193991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19939123 - 2¹ = 19939121 is a prime.

Together with 19939121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19939121) 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, 9969561 + 9969562.

It is an arithmetic number, because the mean of its divisors is an integer number (9969562).

Almost surely, 2^19939123 is an apocalyptic number.

19939123 is a deficient number, since it is larger than the sum of its proper divisors (1).

19939123 is an equidigital number, since it uses as much as digits as its factorization.

19939123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 37.

The square root of 19939123 is about 4465.3245122835. The cubic root of 19939123 is about 271.1660724157.

The spelling of 19939123 in words is "nineteen million, nine hundred thirty-nine thousand, one hundred twenty-three".