9998881 has 8 divisors (see below), whose sum is σ = 10408680. Its totient is φ = 9593472.

The previous prime is 9998867. The next prime is 9998887. The reversal of 9998881 is 1888999.

It can be written as a sum of positive squares in 4 ways, for example, as 4800481 + 5198400 = 2191^2 + 2280^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9998881 - 2⁷ = 9998753 is a prime.

It is a super-2 number, since 2×9998881² = 199955242504322, which contains 22 as substring.

9998881 is a lucky number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9998887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4021 + ... + 6013.

It is an arithmetic number, because the mean of its divisors is an integer number (1301085).

Almost surely, 2^9998881 is an apocalyptic number.

It is an amenable number.

9998881 is a deficient number, since it is larger than the sum of its proper divisors (409799).

9998881 is a wasteful number, since it uses less digits than its factorization.

9998881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195.

The product of its digits is 373248, while the sum is 52.

The square root of 9998881 is about 3162.1007257834. The cubic root of 9998881 is about 215.4354326620.

The spelling of 9998881 in words is "nine million, nine hundred ninety-eight thousand, eight hundred eighty-one".