8138493823 has 2 divisors, whose sum is σ = 8138493824. Its totient is φ = 8138493822.

The previous prime is 8138493757. The next prime is 8138493911. The reversal of 8138493823 is 3283948318.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8138493823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8138490823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069246911 + 4069246912.

It is an arithmetic number, because the mean of its divisors is an integer number (4069246912).

Almost surely, 2^8138493823 is an apocalyptic number.

8138493823 is a deficient number, since it is larger than the sum of its proper divisors (1).

8138493823 is an equidigital number, since it uses as much as digits as its factorization.

8138493823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 49.

The square root of 8138493823 is about 90213.6010976172. The cubic root of 8138493823 is about 2011.4751860483.

The spelling of 8138493823 in words is "eight billion, one hundred thirty-eight million, four hundred ninety-three thousand, eight hundred twenty-three".