84139393 has 4 divisors (see below), whose sum is σ = 90611668. Its totient is φ = 77667120.

The previous prime is 84139387. The next prime is 84139423. The reversal of 84139393 is 39393148.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33558849 + 50580544 = 5793^2 + 7112^2 .

It is a cyclic number.

It is not a de Polignac number, because 84139393 - 2⁹ = 84138881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84139333) 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, 3236118 + ... + 3236143.

It is an arithmetic number, because the mean of its divisors is an integer number (22652917).

Almost surely, 2^84139393 is an apocalyptic number.

It is an amenable number.

84139393 is a deficient number, since it is larger than the sum of its proper divisors (6472275).

84139393 is a wasteful number, since it uses less digits than its factorization.

84139393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472274.

The product of its digits is 69984, while the sum is 40.

The square root of 84139393 is about 9172.7527493114. The cubic root of 84139393 is about 438.1940318223.

The spelling of 84139393 in words is "eighty-four million, one hundred thirty-nine thousand, three hundred ninety-three".