1306145 has 4 divisors (see below), whose sum is σ = 1567380. Its totient is φ = 1044912.

The previous prime is 1306139. The next prime is 1306157. The reversal of 1306145 is 5416031.

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 776161 + 529984 = 881^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306145 - 2¹⁰ = 1305121 is a prime.

It is a super-2 number, since 2×1306145² = 3412029522050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130610 + ... + 130619.

It is an arithmetic number, because the mean of its divisors is an integer number (391845).

2^1306145 is an apocalyptic number.

It is an amenable number.

1306145 is a deficient number, since it is larger than the sum of its proper divisors (261235).

1306145 is an equidigital number, since it uses as much as digits as its factorization.

1306145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261234.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1306145 is about 1142.8670088860. The cubic root of 1306145 is about 109.3109824015.

The spelling of 1306145 in words is "one million, three hundred six thousand, one hundred forty-five".