1001623 has 16 divisors (see below), whose sum is σ = 1278720. Its totient is φ = 763776.

The previous prime is 1001621. The next prime is 1001629. The reversal of 1001623 is 3261001.

It is not a de Polignac number, because 1001623 - 2¹ = 1001621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2040 + ... + 2482.

It is an arithmetic number, because the mean of its divisors is an integer number (79920).

2^1001623 is an apocalyptic number.

1001623 is a deficient number, since it is larger than the sum of its proper divisors (277097).

1001623 is a wasteful number, since it uses less digits than its factorization.

1001623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1001623 is about 1000.8111710008. The cubic root of 1001623 is about 100.0540707583.

Adding to 1001623 its reverse (3261001), we get a palindrome (4262624).

The spelling of 1001623 in words is "one million, one thousand, six hundred twenty-three".