1304505 has 20 divisors (see below), whose sum is σ = 2339172. Its totient is φ = 695520.

The previous prime is 1304503. The next prime is 1304519. The reversal of 1304505 is 5054031.

It can be written as a sum of positive squares in 2 ways, for example, as 746496 + 558009 = 864^2 + 747^2 .

It is not a de Polignac number, because 1304505 - 2¹ = 1304503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1304503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1206 + ... + 2015.

2^1304505 is an apocalyptic number.

1304505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1304505 is a deficient number, since it is larger than the sum of its proper divisors (1034667).

1304505 is an equidigital number, since it uses as much as digits as its factorization.

1304505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238 (or 3229 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 1304505 is about 1142.1492897165. The cubic root of 1304505 is about 109.2652128292.

Adding to 1304505 its reverse (5054031), we get a palindrome (6358536).

The spelling of 1304505 in words is "one million, three hundred four thousand, five hundred five".