82397989 has 2 divisors, whose sum is σ = 82397990. Its totient is φ = 82397988.

The previous prime is 82397971. The next prime is 82397993. The reversal of 82397989 is 98979328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51595489 + 30802500 = 7183^2 + 5550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82397989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82397999) 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, 41198994 + 41198995.

It is an arithmetic number, because the mean of its divisors is an integer number (41198995).

Almost surely, 2^82397989 is an apocalyptic number.

It is an amenable number.

82397989 is a deficient number, since it is larger than the sum of its proper divisors (1).

82397989 is an equidigital number, since it uses as much as digits as its factorization.

82397989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 82397989 is about 9077.3338045926. Note that the first 3 decimals coincide. The cubic root of 82397989 is about 435.1498827322.

The spelling of 82397989 in words is "eighty-two million, three hundred ninety-seven thousand, nine hundred eighty-nine".