19998098 has 4 divisors (see below), whose sum is σ = 29997150. Its totient is φ = 9999048.

The previous prime is 19998047. The next prime is 19998149. The reversal of 19998098 is 89089991.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (19998047) and next prime (19998149).

It can be written as a sum of positive squares in only one way, i.e., 11135569 + 8862529 = 3337^2 + 2977^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999523 + ... + 4999526.

Almost surely, 2^19998098 is an apocalyptic number.

19998098 is a deficient number, since it is larger than the sum of its proper divisors (9999052).

19998098 is an equidigital number, since it uses as much as digits as its factorization.

19998098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999051.

The product of its (nonzero) digits is 419904, while the sum is 53.

The square root of 19998098 is about 4471.9232998789. The cubic root of 19998098 is about 271.4331566829.

The spelling of 19998098 in words is "nineteen million, nine hundred ninety-eight thousand, ninety-eight".