84644389 has 4 divisors (see below), whose sum is σ = 84911724. Its totient is φ = 84377056.

The previous prime is 84644369. The next prime is 84644401. The reversal of 84644389 is 98344648.

It is a happy number.

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 22896225 + 61748164 = 4785^2 + 7858^2 .

It is a cyclic number.

It is not a de Polignac number, because 84644389 - 2¹³ = 84636197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84644369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133192 + ... + 133825.

It is an arithmetic number, because the mean of its divisors is an integer number (21227931).

Almost surely, 2^84644389 is an apocalyptic number.

It is an amenable number.

84644389 is a deficient number, since it is larger than the sum of its proper divisors (267335).

84644389 is a wasteful number, since it uses less digits than its factorization.

84644389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267334.

The product of its digits is 663552, while the sum is 46.

The square root of 84644389 is about 9200.2385295165. The cubic root of 84644389 is about 439.0689489620.

The spelling of 84644389 in words is "eighty-four million, six hundred forty-four thousand, three hundred eighty-nine".