19998094 has 4 divisors (see below), whose sum is σ = 29997144. Its totient is φ = 9999046.

The previous prime is 19998047. The next prime is 19998149. The reversal of 19998094 is 49089991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49089991 = 349 ⋅140659.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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, 4999522 + ... + 4999525.

It is an arithmetic number, because the mean of its divisors is an integer number (7499286).

Almost surely, 2^19998094 is an apocalyptic number.

19998094 is a deficient number, since it is larger than the sum of its proper divisors (9999050).

19998094 is an equidigital number, since it uses as much as digits as its factorization.

19998094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9999049.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 19998094 is about 4471.9228526440. The cubic root of 19998094 is about 271.4331385856.

The spelling of 19998094 in words is "nineteen million, nine hundred ninety-eight thousand, ninety-four".