84388321 has 4 divisors (see below), whose sum is σ = 84407044. Its totient is φ = 84369600.

The previous prime is 84388307. The next prime is 84388331. The reversal of 84388321 is 12388348.

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 8785296 + 75603025 = 2964^2 + 8695^2 .

It is a cyclic number.

It is not a de Polignac number, because 84388321 - 2¹¹ = 84386273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84388331) 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 in 3 ways as a sum of consecutive naturals, for example, 1981 + ... + 13141.

It is an arithmetic number, because the mean of its divisors is an integer number (21101761).

Almost surely, 2^84388321 is an apocalyptic number.

It is an amenable number.

84388321 is a deficient number, since it is larger than the sum of its proper divisors (18723).

84388321 is a wasteful number, since it uses less digits than its factorization.

84388321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18722.

The product of its digits is 36864, while the sum is 37.

The square root of 84388321 is about 9186.3116102166. The cubic root of 84388321 is about 438.6257414968.

The spelling of 84388321 in words is "eighty-four million, three hundred eighty-eight thousand, three hundred twenty-one".