9998520 has 64 divisors (see below), whose sum is σ = 34283520. Its totient is φ = 2285184.

The previous prime is 9998479. The next prime is 9998539. The reversal of 9998520 is 258999.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5112 + ... + 6791.

It is an arithmetic number, because the mean of its divisors is an integer number (535680).

Almost surely, 2^9998520 is an apocalyptic number.

It is an amenable number.

9998520 is an abundant number, since it is smaller than the sum of its proper divisors (24285000).

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

9998520 is a wasteful number, since it uses less digits than its factorization.

9998520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11924 (or 11920 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 9998520 is about 3162.0436429626. The cubic root of 9998520 is about 215.4328399343.

It can be divided in two parts, 9 and 998520, that multiplied together give a triangular number (8986680 = T₄₂₃₉).

The spelling of 9998520 in words is "nine million, nine hundred ninety-eight thousand, five hundred twenty".