1305530 has 8 divisors (see below), whose sum is σ = 2349972. Its totient is φ = 522208.

The previous prime is 1305527. The next prime is 1305533. The reversal of 1305530 is 355031.

It is an interprime number because it is at equal distance from previous prime (1305527) and next prime (1305533).

It can be written as a sum of positive squares in 2 ways, for example, as 1129969 + 175561 = 1063^2 + 419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1305499 and 1305508.

It is not an unprimeable number, because it can be changed into a prime (1305533) 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, 65267 + ... + 65286.

2^1305530 is an apocalyptic number.

1305530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1305530 is a deficient number, since it is larger than the sum of its proper divisors (1044442).

1305530 is a wasteful number, since it uses less digits than its factorization.

1305530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130560.

The product of its (nonzero) digits is 225, while the sum is 17.

The square root of 1305530 is about 1142.5979170294. The cubic root of 1305530 is about 109.2938233040.

The spelling of 1305530 in words is "one million, three hundred five thousand, five hundred thirty".