19998141 has 4 divisors (see below), whose sum is σ = 26664192. Its totient is φ = 13332092.

The previous prime is 19998047. The next prime is 19998149. The reversal of 19998141 is 14189991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19998141 - 2¹⁴ = 19981757 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19998093 and 19998102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998149) 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 in 3 ways as a sum of consecutive naturals, for example, 3333021 + ... + 3333026.

It is an arithmetic number, because the mean of its divisors is an integer number (6666048).

Almost surely, 2^19998141 is an apocalyptic number.

It is an amenable number.

19998141 is a deficient number, since it is larger than the sum of its proper divisors (6666051).

19998141 is an equidigital number, since it uses as much as digits as its factorization.

19998141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666050.

The product of its digits is 23328, while the sum is 42.

The square root of 19998141 is about 4471.9281076511. The cubic root of 19998141 is about 271.4333512283.

The spelling of 19998141 in words is "nineteen million, nine hundred ninety-eight thousand, one hundred forty-one".