84704639 has 2 divisors, whose sum is σ = 84704640. Its totient is φ = 84704638.

The previous prime is 84704629. The next prime is 84704651. The reversal of 84704639 is 93640748.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84704639 - 2⁴ = 84704623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84704596 and 84704605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84704629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42352319 + 42352320.

It is an arithmetic number, because the mean of its divisors is an integer number (42352320).

Almost surely, 2^84704639 is an apocalyptic number.

84704639 is a deficient number, since it is larger than the sum of its proper divisors (1).

84704639 is an equidigital number, since it uses as much as digits as its factorization.

84704639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 84704639 is about 9203.5123186749. The cubic root of 84704639 is about 439.1731008943.

The spelling of 84704639 in words is "eighty-four million, seven hundred four thousand, six hundred thirty-nine".