9998247 has 8 divisors (see below), whose sum is σ = 15235456. Its totient is φ = 5713272.

The previous prime is 9998239. The next prime is 9998249. The reversal of 9998247 is 7428999.

It is a happy number.

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

It is not a de Polignac number, because 9998247 - 2³ = 9998239 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9998196 and 9998205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998249) 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 7 ways as a sum of consecutive naturals, for example, 238033 + ... + 238074.

It is an arithmetic number, because the mean of its divisors is an integer number (1904432).

Almost surely, 2^9998247 is an apocalyptic number.

9998247 is a deficient number, since it is larger than the sum of its proper divisors (5237209).

9998247 is a wasteful number, since it uses less digits than its factorization.

9998247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476117.

The product of its digits is 326592, while the sum is 48.

The square root of 9998247 is about 3162.0004743833. Note that the first 3 decimals coincide. The cubic root of 9998247 is about 215.4308791875.

It can be divided in two parts, 99 and 98247, that added together give a triangular number (98346 = T₄₄₃).

The spelling of 9998247 in words is "nine million, nine hundred ninety-eight thousand, two hundred forty-seven".