1023605 has 16 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 722880.

The previous prime is 1023601. The next prime is 1023643. The reversal of 1023605 is 5063201.

It is not a de Polignac number, because 1023605 - 2² = 1023601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1784 + ... + 2286.

It is an arithmetic number, because the mean of its divisors is an integer number (86184).

2^1023605 is an apocalyptic number.

It is an amenable number.

1023605 is a deficient number, since it is larger than the sum of its proper divisors (355339).

1023605 is a wasteful number, since it uses less digits than its factorization.

1023605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1023605 is about 1011.7336606044. The cubic root of 1023605 is about 100.7807221994.

Adding to 1023605 its reverse (5063201), we get a palindrome (6086806).

The spelling of 1023605 in words is "one million, twenty-three thousand, six hundred five".