83820839 has 2 divisors, whose sum is σ = 83820840. Its totient is φ = 83820838.

The previous prime is 83820833. The next prime is 83820871. The reversal of 83820839 is 93802838.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83820839 - 2¹² = 83816743 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 83820796 and 83820805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83820833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41910419 + 41910420.

It is an arithmetic number, because the mean of its divisors is an integer number (41910420).

Almost surely, 2^83820839 is an apocalyptic number.

83820839 is a deficient number, since it is larger than the sum of its proper divisors (1).

83820839 is an equidigital number, since it uses as much as digits as its factorization.

83820839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 83820839 is about 9155.3721388046. The cubic root of 83820839 is about 437.6403276655.

The spelling of 83820839 in words is "eighty-three million, eight hundred twenty thousand, eight hundred thirty-nine".