84539643 has 4 divisors (see below), whose sum is σ = 112719528. Its totient is φ = 56359760.

The previous prime is 84539641. The next prime is 84539659. The reversal of 84539643 is 34693548.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84539643 - 2¹ = 84539641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84539595 and 84539604.

It is not an unprimeable number, because it can be changed into a prime (84539641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14089938 + ... + 14089943.

It is an arithmetic number, because the mean of its divisors is an integer number (28179882).

Almost surely, 2^84539643 is an apocalyptic number.

84539643 is a deficient number, since it is larger than the sum of its proper divisors (28179885).

84539643 is a wasteful number, since it uses less digits than its factorization.

84539643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28179884.

The product of its digits is 311040, while the sum is 42.

The square root of 84539643 is about 9194.5441975119. The cubic root of 84539643 is about 438.8877607358.

The spelling of 84539643 in words is "eighty-four million, five hundred thirty-nine thousand, six hundred forty-three".