99999956 has 12 divisors (see below), whose sum is σ = 199999968.
Its totient is φ = 42857112.
The previous prime is 99999941. The next prime is 99999959. The reversal of 99999956 is 65999999.
99999956 is an admirable number.
It is a junction number, because it is equal to n+sod(n) for n = 99999892 and 99999901.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (99999959) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1785686 + ... + 1785741.
It is an arithmetic number, because the mean of its divisors is an integer number (16666664).
Almost surely, 299999956 is an apocalyptic number.
It is an amenable number.
99999956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99999956 is a wasteful number, since it uses less digits than its factorization.
99999956 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3571438 (or 3571436 counting only the distinct ones).
The product of its digits is 15943230, while the sum is 65.
The square root of 99999956 is about 9999.9977999998.
The cubic root of 99999956 is about 464.1588152846.
The spelling of 99999956 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-six".