1023205 has 4 divisors (see below), whose sum is σ = 1227852. Its totient is φ = 818560.

The previous prime is 1023203. The next prime is 1023221. The reversal of 1023205 is 5023201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133956 + 889249 = 366^2 + 943^2 .

It is not a de Polignac number, because 1023205 - 2¹ = 1023203 is a prime.

It is an Ulam number.

It is a Duffinian number.

1023205 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102316 + ... + 102325.

It is an arithmetic number, because the mean of its divisors is an integer number (306963).

2^1023205 is an apocalyptic number.

It is an amenable number.

1023205 is a deficient number, since it is larger than the sum of its proper divisors (204647).

1023205 is an equidigital number, since it uses as much as digits as its factorization.

1023205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204646.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 1023205 is about 1011.5359608042. The cubic root of 1023205 is about 100.7675929354.

Adding to 1023205 its reverse (5023201), we get a palindrome (6046406).

The spelling of 1023205 in words is "one million, twenty-three thousand, two hundred five".