8143409 has 4 divisors (see below), whose sum is σ = 8156016. Its totient is φ = 8130804.

The previous prime is 8143351. The next prime is 8143427. The reversal of 8143409 is 9043418.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8143409 is a prime.

It is a super-2 number, since 2×8143409² = 132630220282562, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (8143309) 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, 5279 + ... + 6644.

It is an arithmetic number, because the mean of its divisors is an integer number (2039004).

Almost surely, 2^8143409 is an apocalyptic number.

It is an amenable number.

8143409 is a deficient number, since it is larger than the sum of its proper divisors (12607).

8143409 is a wasteful number, since it uses less digits than its factorization.

8143409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12606.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 8143409 is about 2853.6658879413. The cubic root of 8143409 is about 201.1880042570.

Subtracting 8143409 from its reverse (9043418), we obtain a palindrome (900009).

The spelling of 8143409 in words is "eight million, one hundred forty-three thousand, four hundred nine".