9998919 has 24 divisors (see below), whose sum is σ = 16894592. Its totient is φ = 5579280.

The previous prime is 9998903. The next prime is 9998929. The reversal of 9998919 is 9198999.

It is not a de Polignac number, because 9998919 - 2⁴ = 9998903 is a prime.

It is a super-2 number, since 2×9998919² = 199956762337122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 864 + ... + 4554.

Almost surely, 2^9998919 is an apocalyptic number.

9998919 is a deficient number, since it is larger than the sum of its proper divisors (6895673).

9998919 is a wasteful number, since it uses less digits than its factorization.

9998919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747 (or 3744 counting only the distinct ones).

The product of its digits is 472392, while the sum is 54.

The square root of 9998919 is about 3162.1067344415. The cubic root of 9998919 is about 215.4357055771.

The spelling of 9998919 in words is "nine million, nine hundred ninety-eight thousand, nine hundred nineteen".