9998939 has 4 divisors (see below), whose sum is σ = 10343760. Its totient is φ = 9654120.

The previous prime is 9998929. The next prime is 9998969. The reversal of 9998939 is 9398999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9398999 = 37 ⋅254027.

It is a cyclic number.

It is not a de Polignac number, because 9998939 - 2²⁰ = 8950363 is a prime.

It is a super-2 number, since 2×9998939² = 199957562251442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9998929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172367 + ... + 172424.

It is an arithmetic number, because the mean of its divisors is an integer number (2585940).

Almost surely, 2^9998939 is an apocalyptic number.

9998939 is a deficient number, since it is larger than the sum of its proper divisors (344821).

9998939 is a wasteful number, since it uses less digits than its factorization.

9998939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344820.

The product of its digits is 1417176, while the sum is 56.

The square root of 9998939 is about 3162.1098968885. The cubic root of 9998939 is about 215.4358492163.

The spelling of 9998939 in words is "nine million, nine hundred ninety-eight thousand, nine hundred thirty-nine".