1305215 has 4 divisors (see below), whose sum is σ = 1566264. Its totient is φ = 1044168.

The previous prime is 1305169. The next prime is 1305229. The reversal of 1305215 is 5125031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5125031 = 67 ⋅76493.

It is a cyclic number.

It is not a de Polignac number, because 1305215 - 2⁶ = 1305151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1305193 and 1305202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130517 + ... + 130526.

It is an arithmetic number, because the mean of its divisors is an integer number (391566).

2^1305215 is an apocalyptic number.

1305215 is a deficient number, since it is larger than the sum of its proper divisors (261049).

1305215 is an equidigital number, since it uses as much as digits as its factorization.

1305215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261048.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1305215 is about 1142.4600649476. The cubic root of 1305215 is about 109.2850324110.

The spelling of 1305215 in words is "one million, three hundred five thousand, two hundred fifteen".