19764973 has 2 divisors, whose sum is σ = 19764974. Its totient is φ = 19764972.

The previous prime is 19764971. The next prime is 19764989. The reversal of 19764973 is 37946791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 946729 = 4338^2 + 973^2 .

It is an emirp because it is prime and its reverse (37946791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19764973 - 2¹ = 19764971 is a prime.

Together with 19764971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19764971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9882486 + 9882487.

It is an arithmetic number, because the mean of its divisors is an integer number (9882487).

Almost surely, 2^19764973 is an apocalyptic number.

It is an amenable number.

19764973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19764973 is an equidigital number, since it uses as much as digits as its factorization.

19764973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 46.

The square root of 19764973 is about 4445.7814836089. The cubic root of 19764973 is about 270.3743002561.

The spelling of 19764973 in words is "nineteen million, seven hundred sixty-four thousand, nine hundred seventy-three".