84075209 has 4 divisors (see below), whose sum is σ = 88500240. Its totient is φ = 79650180.

The previous prime is 84075203. The next prime is 84075241. The reversal of 84075209 is 90257048.

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 a de Polignac number, because none of the positive numbers 2^k-84075209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84075203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212487 + ... + 2212524.

It is an arithmetic number, because the mean of its divisors is an integer number (22125060).

Almost surely, 2^84075209 is an apocalyptic number.

It is an amenable number.

84075209 is a deficient number, since it is larger than the sum of its proper divisors (4425031).

84075209 is a wasteful number, since it uses less digits than its factorization.

84075209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425030.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 84075209 is about 9169.2534592517. The cubic root of 84075209 is about 438.0825810527.

The spelling of 84075209 in words is "eighty-four million, seventy-five thousand, two hundred nine".