82439173 has 2 divisors, whose sum is σ = 82439174. Its totient is φ = 82439172.

The previous prime is 82439143. The next prime is 82439209. The reversal of 82439173 is 37193428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78269409 + 4169764 = 8847^2 + 2042^2 .

It is a cyclic number.

It is not a de Polignac number, because 82439173 - 2²¹ = 80342021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82439143) 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, 41219586 + 41219587.

It is an arithmetic number, because the mean of its divisors is an integer number (41219587).

Almost surely, 2^82439173 is an apocalyptic number.

It is an amenable number.

82439173 is a deficient number, since it is larger than the sum of its proper divisors (1).

82439173 is an equidigital number, since it uses as much as digits as its factorization.

82439173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 82439173 is about 9079.6020287235. The cubic root of 82439173 is about 435.2223692417. Note that the first 3 decimals are identical.

It can be divided in two parts, 824391 and 73, that added together give a square (824464 = 908²).

The spelling of 82439173 in words is "eighty-two million, four hundred thirty-nine thousand, one hundred seventy-three".