9998855 has 4 divisors (see below), whose sum is σ = 11998632. Its totient is φ = 7999080.

The previous prime is 9998851. The next prime is 9998861. The reversal of 9998855 is 5588999.

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

It is not a de Polignac number, because 9998855 - 2² = 9998851 is a prime.

It is a super-2 number, since 2×9998855² = 199954202622050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9998797 and 9998806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998851) 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, 999881 + ... + 999890.

It is an arithmetic number, because the mean of its divisors is an integer number (2999658).

Almost surely, 2^9998855 is an apocalyptic number.

9998855 is a deficient number, since it is larger than the sum of its proper divisors (1999777).

9998855 is a wasteful number, since it uses less digits than its factorization.

9998855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999776.

The product of its digits is 1166400, while the sum is 53.

The square root of 9998855 is about 3162.0966145898. The cubic root of 9998855 is about 215.4352459303.

The spelling of 9998855 in words is "nine million, nine hundred ninety-eight thousand, eight hundred fifty-five".