9998724 has 24 divisors (see below), whose sum is σ = 23391648. Its totient is φ = 3324160.

The previous prime is 9998719. The next prime is 9998741. The reversal of 9998724 is 4278999.

It is a happy number.

It is an Ulam number.

It is a d-powerful number, because it can be written as 9² + 9² + 9⁴ + 8⁵ + 7⁸ + 2⁷ + 4¹¹ .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5044 + ... + 6740.

It is an arithmetic number, because the mean of its divisors is an integer number (974652).

Almost surely, 2^9998724 is an apocalyptic number.

It is an amenable number.

9998724 is an abundant number, since it is smaller than the sum of its proper divisors (13392924).

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

9998724 is a wasteful number, since it uses less digits than its factorization.

9998724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195 (or 2193 counting only the distinct ones).

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

The square root of 9998724 is about 3162.0759004173. The cubic root of 9998724 is about 215.4343050845.

The spelling of 9998724 in words is "nine million, nine hundred ninety-eight thousand, seven hundred twenty-four".