1203505 has 4 divisors (see below), whose sum is σ = 1444212. Its totient is φ = 962800.

The previous prime is 1203493. The next prime is 1203509. The reversal of 1203505 is 5053021.

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 802816 + 400689 = 896^2 + 633^2 .

It is not a de Polignac number, because 1203505 - 2¹⁷ = 1072433 is a prime.

It is a Duffinian number.

1203505 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1203509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120346 + ... + 120355.

It is an arithmetic number, because the mean of its divisors is an integer number (361053).

2^1203505 is an apocalyptic number.

It is an amenable number.

1203505 is a deficient number, since it is larger than the sum of its proper divisors (240707).

1203505 is an equidigital number, since it uses as much as digits as its factorization.

1203505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240706.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 1203505 is about 1097.0437548248. The cubic root of 1203505 is about 106.3692179690.

Adding to 1203505 its reverse (5053021), we get a palindrome (6256526).

The spelling of 1203505 in words is "one million, two hundred three thousand, five hundred five".