999706823 has 2 divisors, whose sum is σ = 999706824. Its totient is φ = 999706822.

The previous prime is 999706781. The next prime is 999706861. The reversal of 999706823 is 328607999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999706823 - 2²⁰ = 998658247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999705823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499853411 + 499853412.

It is an arithmetic number, because the mean of its divisors is an integer number (499853412).

Almost surely, 2^999706823 is an apocalyptic number.

999706823 is a deficient number, since it is larger than the sum of its proper divisors (1).

999706823 is an equidigital number, since it uses as much as digits as its factorization.

999706823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 999706823 is about 31618.1407264880. The cubic root of 999706823 is about 999.9022647815.

The spelling of 999706823 in words is "nine hundred ninety-nine million, seven hundred six thousand, eight hundred twenty-three".