19998067 has 4 divisors (see below), whose sum is σ = 20150856. Its totient is φ = 19845280.

The previous prime is 19998047. The next prime is 19998149. The reversal of 19998067 is 76089991.

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

It is a cyclic number.

It is not a de Polignac number, because 19998067 - 2¹¹ = 19996019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19998067.

It is not an unprimeable number, because it can be changed into a prime (19998047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76198 + ... + 76459.

It is an arithmetic number, because the mean of its divisors is an integer number (5037714).

Almost surely, 2^19998067 is an apocalyptic number.

19998067 is a deficient number, since it is larger than the sum of its proper divisors (152789).

19998067 is a wasteful number, since it uses less digits than its factorization.

19998067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152788.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19998067 is about 4471.9198338074. The cubic root of 19998067 is about 271.4330164290.

The spelling of 19998067 in words is "nineteen million, nine hundred ninety-eight thousand, sixty-seven".