82140389 has 2 divisors, whose sum is σ = 82140390. Its totient is φ = 82140388.

The previous prime is 82140361. The next prime is 82140391. The reversal of 82140389 is 98304128.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82047364 + 93025 = 9058^2 + 305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82140389 is a prime.

Together with 82140391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82140319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41070194 + 41070195.

It is an arithmetic number, because the mean of its divisors is an integer number (41070195).

Almost surely, 2^82140389 is an apocalyptic number.

It is an amenable number.

82140389 is a deficient number, since it is larger than the sum of its proper divisors (1).

82140389 is an equidigital number, since it uses as much as digits as its factorization.

82140389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 82140389 is about 9063.1335088919. The cubic root of 82140389 is about 434.6959411257.

The spelling of 82140389 in words is "eighty-two million, one hundred forty thousand, three hundred eighty-nine".