84318209 has 4 divisors (see below), whose sum is σ = 84394416. Its totient is φ = 84242004.

The previous prime is 84318193. The next prime is 84318211. The reversal of 84318209 is 90281348.

It is a happy number.

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 not a de Polignac number, because 84318209 - 2⁴ = 84318193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84318229) 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, 36419 + ... + 38664.

It is an arithmetic number, because the mean of its divisors is an integer number (21098604).

Almost surely, 2^84318209 is an apocalyptic number.

It is an amenable number.

84318209 is a deficient number, since it is larger than the sum of its proper divisors (76207).

84318209 is a wasteful number, since it uses less digits than its factorization.

84318209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76206.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 84318209 is about 9182.4947045996. The cubic root of 84318209 is about 438.5042339693.

The spelling of 84318209 in words is "eighty-four million, three hundred eighteen thousand, two hundred nine".