1305823 has 2 divisors, whose sum is σ = 1305824. Its totient is φ = 1305822.

The previous prime is 1305803. The next prime is 1305869. The reversal of 1305823 is 3285031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1305823 - 2¹³ = 1297631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1305794 and 1305803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652911 + 652912.

It is an arithmetic number, because the mean of its divisors is an integer number (652912).

2^1305823 is an apocalyptic number.

1305823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305823 is an equidigital number, since it uses as much as digits as its factorization.

1305823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1305823 is about 1142.7261264187. The cubic root of 1305823 is about 109.3019989606.

The spelling of 1305823 in words is "one million, three hundred five thousand, eight hundred twenty-three".