8306405 has 4 divisors (see below), whose sum is σ = 9967692. Its totient is φ = 6645120.

The previous prime is 8306393. The next prime is 8306407. The reversal of 8306405 is 5046038.

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 1747684 + 6558721 = 1322^2 + 2561^2 .

It is not a de Polignac number, because 8306405 - 2¹² = 8302309 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 (8306407) 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, 830636 + ... + 830645.

It is an arithmetic number, because the mean of its divisors is an integer number (2491923).

Almost surely, 2^8306405 is an apocalyptic number.

It is an amenable number.

8306405 is a deficient number, since it is larger than the sum of its proper divisors (1661287).

8306405 is a wasteful number, since it uses less digits than its factorization.

8306405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661286.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 8306405 is about 2882.0834477856. The cubic root of 8306405 is about 202.5214527900.

The spelling of 8306405 in words is "eight million, three hundred six thousand, four hundred five".