19973713 has 2 divisors, whose sum is σ = 19973714. Its totient is φ = 19973712.

The previous prime is 19973711. The next prime is 19973741. The reversal of 19973713 is 31737991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 859329 = 4372^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 19973713 - 2¹ = 19973711 is a prime.

It is a super-2 number, since 2×19973713² = 797898422012738, which contains 22 as substring.

Together with 19973711, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19973711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986856 + 9986857.

It is an arithmetic number, because the mean of its divisors is an integer number (9986857).

Almost surely, 2^19973713 is an apocalyptic number.

It is an amenable number.

19973713 is a deficient number, since it is larger than the sum of its proper divisors (1).

19973713 is an equidigital number, since it uses as much as digits as its factorization.

19973713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721, while the sum is 40.

The square root of 19973713 is about 4469.1960127074. The cubic root of 19973713 is about 271.3227863594.

The spelling of 19973713 in words is "nineteen million, nine hundred seventy-three thousand, seven hundred thirteen".