1405823 has 2 divisors, whose sum is σ = 1405824. Its totient is φ = 1405822.

The previous prime is 1405813. The next prime is 1405841. The reversal of 1405823 is 3285041.

It is a weak prime.

It is an emirp because it is prime and its reverse (3285041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1405823 - 2⁶ = 1405759 is a prime.

It is equal to p₁₀₇₅₁₉ and since 1405823 and 107519 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702911 + 702912.

It is an arithmetic number, because the mean of its divisors is an integer number (702912).

2^1405823 is an apocalyptic number.

1405823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405823 is an equidigital number, since it uses as much as digits as its factorization.

1405823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1405823 is about 1185.6740698860. The cubic root of 1405823 is about 112.0237779022.

The spelling of 1405823 in words is "one million, four hundred five thousand, eight hundred twenty-three".