84920809 has 8 divisors (see below), whose sum is σ = 87333120. Its totient is φ = 82514736.

The previous prime is 84920789. The next prime is 84920821. The reversal of 84920809 is 90802948.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84920809 - 2¹¹ = 84918761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84920309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45672 + ... + 47494.

It is an arithmetic number, because the mean of its divisors is an integer number (10916640).

Almost surely, 2^84920809 is an apocalyptic number.

It is an amenable number.

84920809 is a deficient number, since it is larger than the sum of its proper divisors (2412311).

84920809 is a wasteful number, since it uses less digits than its factorization.

84920809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 84920809 is about 9215.2487215484. The cubic root of 84920809 is about 439.5463799508.

The spelling of 84920809 in words is "eighty-four million, nine hundred twenty thousand, eight hundred nine".