19764923 has 2 divisors, whose sum is σ = 19764924. Its totient is φ = 19764922.

The previous prime is 19764893. The next prime is 19764929. The reversal of 19764923 is 32946791.

It is a strong prime.

It is an emirp because it is prime and its reverse (32946791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19764923 - 2⁶ = 19764859 is a prime.

It is not a weakly prime, because it can be changed into another prime (19764929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9882461 + 9882462.

It is an arithmetic number, because the mean of its divisors is an integer number (9882462).

Almost surely, 2^19764923 is an apocalyptic number.

19764923 is a deficient number, since it is larger than the sum of its proper divisors (1).

19764923 is an equidigital number, since it uses as much as digits as its factorization.

19764923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 19764923 is about 4445.7758602971. The cubic root of 19764923 is about 270.3740722648.

The spelling of 19764923 in words is "nineteen million, seven hundred sixty-four thousand, nine hundred twenty-three".