8381389 has 4 divisors (see below), whose sum is σ = 8390620. Its totient is φ = 8372160.

The previous prime is 8381371. The next prime is 8381393. The reversal of 8381389 is 9831838.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2418025 + 5963364 = 1555^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 8381389 - 2⁹ = 8380877 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 (8381309) 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 in 3 ways as a sum of consecutive naturals, for example, 3084 + ... + 5125.

It is an arithmetic number, because the mean of its divisors is an integer number (2097655).

Almost surely, 2^8381389 is an apocalyptic number.

It is an amenable number.

8381389 is a deficient number, since it is larger than the sum of its proper divisors (9231).

8381389 is a wasteful number, since it uses less digits than its factorization.

8381389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9230.

The product of its digits is 41472, while the sum is 40.

The square root of 8381389 is about 2895.0628663295. The cubic root of 8381389 is about 203.1290321566.

The spelling of 8381389 in words is "eight million, three hundred eighty-one thousand, three hundred eighty-nine".