8140309 has 4 divisors (see below), whose sum is σ = 8146060. Its totient is φ = 8134560.

The previous prime is 8140291. The next prime is 8140313. The reversal of 8140309 is 9030418.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9030418 = 2 ⋅4515209.

It can be written as a sum of positive squares in 2 ways, for example, as 731025 + 7409284 = 855^2 + 2722^2 .

It is a cyclic number.

It is not a de Polignac number, because 8140309 - 2⁹ = 8139797 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 (8140339) 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, 907 + ... + 4135.

It is an arithmetic number, because the mean of its divisors is an integer number (2036515).

Almost surely, 2^8140309 is an apocalyptic number.

It is an amenable number.

8140309 is a deficient number, since it is larger than the sum of its proper divisors (5751).

8140309 is a wasteful number, since it uses less digits than its factorization.

8140309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5750.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 8140309 is about 2853.1226752455. The cubic root of 8140309 is about 201.1624718716.

The spelling of 8140309 in words is "eight million, one hundred forty thousand, three hundred nine".