99986520 has 128 divisors (see below), whose sum is σ = 331568640. Its totient is φ = 23992320.

The previous prime is 99986507. The next prime is 99986521. The reversal of 99986520 is 2568999.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99986520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99986521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45855 + ... + 47985.

It is an arithmetic number, because the mean of its divisors is an integer number (2590380).

Almost surely, 2^99986520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99986520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165784320).

99986520 is an abundant number, since it is smaller than the sum of its proper divisors (231582120).

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

99986520 is a wasteful number, since it uses less digits than its factorization.

99986520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 99986520 is about 9999.3259772847. The cubic root of 99986520 is about 464.1380262182.

The spelling of 99986520 in words is "ninety-nine million, nine hundred eighty-six thousand, five hundred twenty".