8281389 has 4 divisors (see below), whose sum is σ = 11041856. Its totient is φ = 5520924.

The previous prime is 8281387. The next prime is 8281391. The reversal of 8281389 is 9831828.

8281389 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8281387) and next prime (8281391).

It is not a de Polignac number, because 8281389 - 2¹ = 8281387 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 (8281381) 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, 1380229 + ... + 1380234.

It is an arithmetic number, because the mean of its divisors is an integer number (2760464).

Almost surely, 2^8281389 is an apocalyptic number.

It is an amenable number.

8281389 is a deficient number, since it is larger than the sum of its proper divisors (2760467).

8281389 is a wasteful number, since it uses less digits than its factorization.

8281389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760466.

The product of its digits is 27648, while the sum is 39.

The square root of 8281389 is about 2877.7402593007. The cubic root of 8281389 is about 202.3179403140.

The spelling of 8281389 in words is "eight million, two hundred eighty-one thousand, three hundred eighty-nine".