1005665 has 8 divisors (see below), whose sum is σ = 1216320. Its totient is φ = 798192.

The previous prime is 1005661. The next prime is 1005677. The reversal of 1005665 is 5665001.

1005665 = 6² + 7² + ... + 144².

1005665 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 a cyclic number.

It is not a de Polignac number, because 1005665 - 2² = 1005661 is a prime.

It is a super-2 number, since 2×1005665² = 2022724184450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1005665.

It is not an unprimeable number, because it can be changed into a prime (1005661) 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, 29 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (152040).

2^1005665 is an apocalyptic number.

It is an amenable number.

1005665 is a deficient number, since it is larger than the sum of its proper divisors (210655).

1005665 is a wasteful number, since it uses less digits than its factorization.

1005665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1005665 is about 1002.8284997945. The cubic root of 1005665 is about 100.1884778711.

The spelling of 1005665 in words is "one million, five thousand, six hundred sixty-five".