9931898 has 8 divisors (see below), whose sum is σ = 15142260. Its totient is φ = 4884480.

The previous prime is 9931897. The next prime is 9931903. The reversal of 9931898 is 8981399.

It can be written as a sum of positive squares in 2 ways, for example, as 8602489 + 1329409 = 2933^2 + 1153^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9931897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40583 + ... + 40826.

Almost surely, 2^9931898 is an apocalyptic number.

9931898 is a deficient number, since it is larger than the sum of its proper divisors (5210362).

9931898 is a wasteful number, since it uses less digits than its factorization.

9931898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81472.

The product of its digits is 139968, while the sum is 47.

The square root of 9931898 is about 3151.4913929757. The cubic root of 9931898 is about 214.9532835222.

The spelling of 9931898 in words is "nine million, nine hundred thirty-one thousand, eight hundred ninety-eight".