999965 has 8 divisors (see below), whose sum is σ = 1228128. Its totient is φ = 781200.

The previous prime is 999961. The next prime is 999979. The reversal of 999965 is 569999.

999965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999965 - 2² = 999961 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2111 + ... + 2540.

It is an arithmetic number, because the mean of its divisors is an integer number (153516).

2⁹⁹⁹⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

999965 is a deficient number, since it is larger than the sum of its proper divisors (228163).

999965 is a wasteful number, since it uses less digits than its factorization.

999965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699.

The product of its digits is 196830, while the sum is 47.

The square root of 999965 is about 999.9824998469. The cubic root of 999965 is about 99.9988333197.

It can be divided in two parts, 99996 and 5, that added together give a palindrome (100001).

The spelling of 999965 in words is "nine hundred ninety-nine thousand, nine hundred sixty-five".