9998658 has 24 divisors (see below), whose sum is σ = 22250748. Its totient is φ = 3242592.

The previous prime is 9998641. The next prime is 9998689. The reversal of 9998658 is 8568999.

It can be written as a sum of positive squares in 2 ways, for example, as 8838729 + 1159929 = 2973^2 + 1077^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6841 + ... + 8172.

Almost surely, 2^9998658 is an apocalyptic number.

9998658 is an abundant number, since it is smaller than the sum of its proper divisors (12252090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9998658 is a wasteful number, since it uses less digits than its factorization.

9998658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15058 (or 15055 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 9998658 is about 3162.0654642180. The cubic root of 9998658 is about 215.4338310675.

The spelling of 9998658 in words is "nine million, nine hundred ninety-eight thousand, six hundred fifty-eight".