709823 has 2 divisors, whose sum is σ = 709824. Its totient is φ = 709822.

The previous prime is 709817. The next prime is 709831. The reversal of 709823 is 328907.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-709823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (709843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354911 + 354912.

It is an arithmetic number, because the mean of its divisors is an integer number (354912).

2⁷⁰⁹⁸²³ is an apocalyptic number.

709823 is a deficient number, since it is larger than the sum of its proper divisors (1).

709823 is an equidigital number, since it uses as much as digits as its factorization.

709823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 709823 is about 842.5099405942. The cubic root of 709823 is about 89.2038001022.

The spelling of 709823 in words is "seven hundred nine thousand, eight hundred twenty-three".