84620839 has 2 divisors, whose sum is σ = 84620840. Its totient is φ = 84620838.

The previous prime is 84620819. The next prime is 84620863. The reversal of 84620839 is 93802648.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84620839 - 2²¹ = 82523687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84620819) 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, 42310419 + 42310420.

It is an arithmetic number, because the mean of its divisors is an integer number (42310420).

Almost surely, 2^84620839 is an apocalyptic number.

84620839 is a deficient number, since it is larger than the sum of its proper divisors (1).

84620839 is an equidigital number, since it uses as much as digits as its factorization.

84620839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 84620839 is about 9198.9585823614. The cubic root of 84620839 is about 439.0282255190.

The spelling of 84620839 in words is "eighty-four million, six hundred twenty thousand, eight hundred thirty-nine".