19998028 has 6 divisors (see below), whose sum is σ = 34996556. Its totient is φ = 9999012.

The previous prime is 19997993. The next prime is 19998029. The reversal of 19998028 is 82089991.

It is a happy number.

It is a super-2 number, since 2×19998028² = 799842247777568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19998029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499750 + ... + 2499757.

Almost surely, 2^19998028 is an apocalyptic number.

It is an amenable number.

19998028 is a deficient number, since it is larger than the sum of its proper divisors (14998528).

19998028 is a wasteful number, since it uses less digits than its factorization.

19998028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999511 (or 4999509 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 19998028 is about 4471.9154732620. The cubic root of 19998028 is about 271.4328399804.

The spelling of 19998028 in words is "nineteen million, nine hundred ninety-eight thousand, twenty-eight".