823638863 has 2 divisors, whose sum is σ = 823638864. Its totient is φ = 823638862.

The previous prime is 823638821. The next prime is 823638913. The reversal of 823638863 is 368836328.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 823638863 - 2¹⁰ = 823637839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823634863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411819431 + 411819432.

It is an arithmetic number, because the mean of its divisors is an integer number (411819432).

Almost surely, 2^823638863 is an apocalyptic number.

823638863 is a deficient number, since it is larger than the sum of its proper divisors (1).

823638863 is an equidigital number, since it uses as much as digits as its factorization.

823638863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 47.

The square root of 823638863 is about 28699.1090976706. The cubic root of 823638863 is about 937.3726477795.

The spelling of 823638863 in words is "eight hundred twenty-three million, six hundred thirty-eight thousand, eight hundred sixty-three".