99870845 has 4 divisors (see below), whose sum is σ = 119845020.
Its totient is φ = 79896672.
The previous prime is 99870833. The next prime is 99870857. The reversal of 99870845 is 54807899.
It is a semiprime because it is the product of two primes.
It is an interprime number because it is at equal distance from previous prime (99870833) and next prime (99870857).
It can be written as a sum of positive squares in 2 ways, for example, as 49942489 + 49928356 = 7067^2 + 7066^2
It is a cyclic number.
It is not a de Polignac number, because 99870845 - 26 = 99870781 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 99870793 and 99870802.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9987080 + ... + 9987089.
It is an arithmetic number, because the mean of its divisors is an integer number (29961255).
Almost surely, 299870845 is an apocalyptic number.
99870845 is the 7067-th centered square number.
It is an amenable number.
99870845 is a deficient number, since it is larger than the sum of its proper divisors (19974175).
99870845 is a wasteful number, since it uses less digits than its factorization.
99870845 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 19974174.
The product of its (nonzero) digits is 725760, while the sum is 50.
The square root of 99870845 is about 9993.5401635256.
The cubic root of 99870845 is about 463.9589691349.
The spelling of 99870845 in words is "ninety-nine million, eight hundred seventy thousand, eight hundred forty-five".