1305861 has 4 divisors (see below), whose sum is σ = 1741152. Its totient is φ = 870572.

The previous prime is 1305823. The next prime is 1305869. The reversal of 1305861 is 1685031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1305861 - 2⁶ = 1305797 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305869) by changing a digit.

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, 217641 + ... + 217646.

It is an arithmetic number, because the mean of its divisors is an integer number (435288).

2^1305861 is an apocalyptic number.

It is an amenable number.

1305861 is a deficient number, since it is larger than the sum of its proper divisors (435291).

1305861 is an equidigital number, since it uses as much as digits as its factorization.

1305861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435290.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1305861 is about 1142.7427532039. The cubic root of 1305861 is about 109.3030591951.

The spelling of 1305861 in words is "one million, three hundred five thousand, eight hundred sixty-one".