1003665 has 16 divisors (see below), whose sum is σ = 1729728. Its totient is φ = 494016.

The previous prime is 1003631. The next prime is 1003679. The reversal of 1003665 is 5663001.

It is not a de Polignac number, because 1003665 - 2⁶ = 1003601 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2379 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^1003665 is an apocalyptic number.

1003665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1003665 is a deficient number, since it is larger than the sum of its proper divisors (726063).

1003665 is a wasteful number, since it uses less digits than its factorization.

1003665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5168.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1003665 is about 1001.8308240417. The cubic root of 1003665 is about 100.1220177229.

Adding to 1003665 its reverse (5663001), we get a palindrome (6666666).

It can be divided in two parts, 10036 and 65, that added together give a palindrome (10101).

The spelling of 1003665 in words is "one million, three thousand, six hundred sixty-five".