19998373 has 2 divisors, whose sum is σ = 19998374. Its totient is φ = 19998372.

The previous prime is 19998367. The next prime is 19998383. The reversal of 19998373 is 37389991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19873764 + 124609 = 4458^2 + 353^2 .

It is a cyclic number.

It is not a de Polignac number, because 19998373 - 2¹⁷ = 19867301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19998353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999186 + 9999187.

It is an arithmetic number, because the mean of its divisors is an integer number (9999187).

Almost surely, 2^19998373 is an apocalyptic number.

It is an amenable number.

19998373 is a deficient number, since it is larger than the sum of its proper divisors (1).

19998373 is an equidigital number, since it uses as much as digits as its factorization.

19998373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 19998373 is about 4471.9540471700. The cubic root of 19998373 is about 271.4344008641.

The spelling of 19998373 in words is "nineteen million, nine hundred ninety-eight thousand, three hundred seventy-three".