99985000 has 40 divisors (see below), whose sum is σ = 234276570.
Its totient is φ = 39992000.
The previous prime is 99984991. The next prime is 99985009. The reversal of 99985000 is 58999.
It is an interprime number because it is at equal distance from previous prime (99984991) and next prime (99985009).
It can be written as a sum of positive squares in 5 ways, for example, as 9696996 + 90288004 = 3114^2 + 9502^2
It is a tau number, because it is divible by the number of its divisors (40).
It is a Harshad number since it is a multiple of its sum of digits (40).
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (99985009) by changing a digit.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4999 + ... + 14998.
Almost surely, 299985000 is an apocalyptic number.
99985000 is the 5000-th decagonal number.
It is an amenable number.
99985000 is an abundant number, since it is smaller than the sum of its proper divisors (134291570).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99985000 is a wasteful number, since it uses less digits than its factorization.
99985000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 20023 (or 20004 counting only the distinct ones).
The product of its (nonzero) digits is 29160, while the sum is 40.
The square root of 99985000 is about 9999.2499718729.
The cubic root of 99985000 is about 464.1356742566.
The spelling of 99985000 in words is "ninety-nine million, nine hundred eighty-five thousand".