99999965 has 8 divisors (see below), whose sum is σ = 129230808.
Its totient is φ = 73846080.
The previous prime is 99999959. The next prime is 99999971. The reversal of 99999965 is 56999999.
It is an interprime number because it is at equal distance from previous prime (99999959) and next prime (99999971).
It can be written as a sum of positive squares in 4 ways, for example, as 7628644 + 92371321 = 2762^2 + 9611^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 99999965 - 212 = 99995869 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (65), and also a Moran number because the ratio is a prime number: 1538461 = 99999965 / (9 + 9 + 9 + 9 + 9 + 9 + 6 + 5).
It is a Duffinian number.
It is a Curzon number.
It is a nialpdrome in base 10.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769166 + ... + 769295.
It is an arithmetic number, because the mean of its divisors is an integer number (16153851).
Almost surely, 299999965 is an apocalyptic number.
It is an amenable number.
99999965 is a deficient number, since it is larger than the sum of its proper divisors (29230843).
99999965 is a wasteful number, since it uses less digits than its factorization.
99999965 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1538479.
The product of its digits is 15943230, while the sum is 65.
The square root of 99999965 is about 9999.9982499998.
The cubic root of 99999965 is about 464.1588292094.
The spelling of 99999965 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-five".