8142209 has 4 divisors (see below), whose sum is σ = 8256960. Its totient is φ = 8027460.

The previous prime is 8142157. The next prime is 8142221. The reversal of 8142209 is 9022418.

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 an emirpimes, since its reverse is a distinct semiprime: 9022418 = 2 ⋅4511209.

It is a cyclic number.

It is not a de Polignac number, because 8142209 - 2²⁰ = 7093633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8142229) 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, 57269 + ... + 57410.

It is an arithmetic number, because the mean of its divisors is an integer number (2064240).

Almost surely, 2^8142209 is an apocalyptic number.

It is an amenable number.

8142209 is a deficient number, since it is larger than the sum of its proper divisors (114751).

8142209 is a wasteful number, since it uses less digits than its factorization.

8142209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114750.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8142209 is about 2853.4556243264. The cubic root of 8142209 is about 201.1781215218.

The spelling of 8142209 in words is "eight million, one hundred forty-two thousand, two hundred nine".