9998789 has 4 divisors (see below), whose sum is σ = 10168320. Its totient is φ = 9829260.

The previous prime is 9998777. The next prime is 9998797. The reversal of 9998789 is 9878999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9878999 = 13 ⋅759923.

It is a cyclic number.

It is not a de Polignac number, because 9998789 - 2²⁰ = 8950213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 169471 = 9998789 / (9 + 9 + 9 + 8 + 7 + 8 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998719) 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, 84677 + ... + 84794.

It is an arithmetic number, because the mean of its divisors is an integer number (2542080).

Almost surely, 2^9998789 is an apocalyptic number.

It is an amenable number.

9998789 is a deficient number, since it is larger than the sum of its proper divisors (169531).

9998789 is a wasteful number, since it uses less digits than its factorization.

9998789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169530.

The product of its digits is 2939328, while the sum is 59.

The square root of 9998789 is about 3162.0861784588. The cubic root of 9998789 is about 215.4347719174.

The spelling of 9998789 in words is "nine million, nine hundred ninety-eight thousand, seven hundred eighty-nine".