8129389 has 4 divisors (see below), whose sum is σ = 8209980. Its totient is φ = 8048800.

The previous prime is 8129371. The next prime is 8129399. The reversal of 8129389 is 9839218.

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 7896100 + 233289 = 2810^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 8129389 - 2⁹ = 8128877 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 (8129339) 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, 40144 + ... + 40345.

It is an arithmetic number, because the mean of its divisors is an integer number (2052495).

Almost surely, 2^8129389 is an apocalyptic number.

It is an amenable number.

8129389 is a deficient number, since it is larger than the sum of its proper divisors (80591).

8129389 is a wasteful number, since it uses less digits than its factorization.

8129389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80590.

The product of its digits is 31104, while the sum is 40.

The square root of 8129389 is about 2851.2083403357. The cubic root of 8129389 is about 201.0724803167.

It can be divided in two parts, 812 and 9389, that added together give a palindrome (10201).

The spelling of 8129389 in words is "eight million, one hundred twenty-nine thousand, three hundred eighty-nine".