82123793 has 4 divisors (see below), whose sum is σ = 82157748. Its totient is φ = 82089840.

The previous prime is 82123781. The next prime is 82123813. The reversal of 82123793 is 39732128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77933584 + 4190209 = 8828^2 + 2047^2 .

It is a cyclic number.

It is not a de Polignac number, because 82123793 - 2²⁰ = 81075217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82123733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13046 + ... + 18287.

It is an arithmetic number, because the mean of its divisors is an integer number (20539437).

Almost surely, 2^82123793 is an apocalyptic number.

It is an amenable number.

82123793 is a deficient number, since it is larger than the sum of its proper divisors (33955).

82123793 is a wasteful number, since it uses less digits than its factorization.

82123793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33954.

The product of its digits is 18144, while the sum is 35.

The square root of 82123793 is about 9062.2178852641. The cubic root of 82123793 is about 434.6666632035. Note that the first 5 decimals are identical.

The spelling of 82123793 in words is "eighty-two million, one hundred twenty-three thousand, seven hundred ninety-three".