1305506 has 4 divisors (see below), whose sum is σ = 1958262. Its totient is φ = 652752.

The previous prime is 1305449. The next prime is 1305511. The reversal of 1305506 is 6055031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6055031 = 97 ⋅62423.

It can be written as a sum of positive squares in only one way, i.e., 1229881 + 75625 = 1109^2 + 275^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326375 + ... + 326378.

2^1305506 is an apocalyptic number.

1305506 is a deficient number, since it is larger than the sum of its proper divisors (652756).

1305506 is an equidigital number, since it uses as much as digits as its factorization.

1305506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652755.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 1305506 is about 1142.5874145990. The cubic root of 1305506 is about 109.2931535715.

The spelling of 1305506 in words is "one million, three hundred five thousand, five hundred six".