996665 has 8 divisors (see below), whose sum is σ = 1218888. Its totient is φ = 782080.

The previous prime is 996649. The next prime is 996689. The reversal of 996665 is 566699.

It can be written as a sum of positive squares in 4 ways, for example, as 157609 + 839056 = 397^2 + 916^2 .

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

It is not a de Polignac number, because 996665 - 2⁴ = 996649 is a prime.

It is a super-2 number, since 2×996665² = 1986682244450, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1616 + ... + 2145.

It is an arithmetic number, because the mean of its divisors is an integer number (152361).

2⁹⁹⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

996665 is a deficient number, since it is larger than the sum of its proper divisors (222223).

996665 is a wasteful number, since it uses less digits than its factorization.

996665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819.

The product of its digits is 87480, while the sum is 41.

The square root of 996665 is about 998.3311073987. The cubic root of 996665 is about 99.8887095236. Note that the first 3 decimals are identical.

It can be divided in two parts, 996 and 665, that added together give a palindrome (1661).

The spelling of 996665 in words is "nine hundred ninety-six thousand, six hundred sixty-five".