1001605 has 8 divisors (see below), whose sum is σ = 1311264. Its totient is φ = 728400.

The previous prime is 1001593. The next prime is 1001621. The reversal of 1001605 is 5061001.

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

It is not a de Polignac number, because 1001605 - 2⁹ = 1001093 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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, 9051 + ... + 9160.

It is an arithmetic number, because the mean of its divisors is an integer number (163908).

2^1001605 is an apocalyptic number.

It is an amenable number.

1001605 is a deficient number, since it is larger than the sum of its proper divisors (309659).

1001605 is a wasteful number, since it uses less digits than its factorization.

1001605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18227.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1001605 is about 1000.8021782550. The cubic root of 1001605 is about 100.0534714030.

Adding to 1001605 its reverse (5061001), we get a palindrome (6062606).

The spelling of 1001605 in words is "one million, one thousand, six hundred five".