99870043 has 12 divisors (see below), whose sum is σ = 123593808.
Its totient is φ = 79017120.
The previous prime is 99870031. The next prime is 99870047. The reversal of 99870043 is 34007899.
It is not a de Polignac number, because 99870043 - 25 = 99870011 is a prime.
It is the 9994-th Hogben number.
It is a junction number, because it is equal to n+sod(n) for n = 99869978 and 99870005.
It is not an unprimeable number, because it can be changed into a prime (99870047) by changing a digit.
It is a nontrivial repunit in base 9993.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41028 + ... + 43393.
It is an arithmetic number, because the mean of its divisors is an integer number (10299484).
Almost surely, 299870043 is an apocalyptic number.
99870043 is a deficient number, since it is larger than the sum of its proper divisors (23723765).
99870043 is a wasteful number, since it uses less digits than its factorization.
99870043 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 84454 (or 84441 counting only the distinct ones).
The product of its (nonzero) digits is 54432, while the sum is 40.
The square root of 99870043 is about 9993.5000375244.
The cubic root of 99870043 is about 463.9577272106.
The spelling of 99870043 in words is "ninety-nine million, eight hundred seventy thousand, forty-three".