8409389 has 4 divisors (see below), whose sum is σ = 8416800. Its totient is φ = 8401980.

The previous prime is 8409383. The next prime is 8409403. The reversal of 8409389 is 9839048.

8409389 is nontrivially palindromic in base 13.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8409389 - 2⁸ = 8409133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8409383) 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, 1607 + ... + 4404.

It is an arithmetic number, because the mean of its divisors is an integer number (2104200).

Almost surely, 2^8409389 is an apocalyptic number.

It is an amenable number.

8409389 is a deficient number, since it is larger than the sum of its proper divisors (7411).

8409389 is a wasteful number, since it uses less digits than its factorization.

8409389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7410.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 8409389 is about 2899.8946532590. The cubic root of 8409389 is about 203.3549808240.

The spelling of 8409389 in words is "eight million, four hundred nine thousand, three hundred eighty-nine".