8406389 has 4 divisors (see below), whose sum is σ = 8413356. Its totient is φ = 8399424.

The previous prime is 8406367. The next prime is 8406439. The reversal of 8406389 is 9836048.

8406389 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 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 1304164 + 7102225 = 1142^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 8406389 - 2¹⁶ = 8340853 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 (8406089) 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, 1154 + ... + 4259.

It is an arithmetic number, because the mean of its divisors is an integer number (2103339).

Almost surely, 2^8406389 is an apocalyptic number.

It is an amenable number.

8406389 is a deficient number, since it is larger than the sum of its proper divisors (6967).

8406389 is a wasteful number, since it uses less digits than its factorization.

8406389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6966.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 8406389 is about 2899.3773469488. The cubic root of 8406389 is about 203.3307960506.

The spelling of 8406389 in words is "eight million, four hundred six thousand, three hundred eighty-nine".