9998858 has 8 divisors (see below), whose sum is σ = 15012228. Its totient is φ = 4994784.

The previous prime is 9998851. The next prime is 9998861. The reversal of 9998858 is 8588999.

It can be written as a sum of positive squares in 2 ways, for example, as 9878449 + 120409 = 3143^2 + 347^2 .

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

It is a super-2 number, since 2×9998858² = 199954322608328, which contains 22 as substring.

It is an Ulam number.

It is a Curzon 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, 1910 + ... + 4862.

Almost surely, 2^9998858 is an apocalyptic number.

9998858 is a deficient number, since it is larger than the sum of its proper divisors (5013370).

9998858 is a wasteful number, since it uses less digits than its factorization.

9998858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4648.

The product of its digits is 1866240, while the sum is 56.

The square root of 9998858 is about 3162.0970889585. The cubic root of 9998858 is about 215.4352674763.

The spelling of 9998858 in words is "nine million, nine hundred ninety-eight thousand, eight hundred fifty-eight".