84912809 has 8 divisors (see below), whose sum is σ = 85536000. Its totient is φ = 84292432.

The previous prime is 84912799. The next prime is 84912829. The reversal of 84912809 is 90821948.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84912809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84912829) 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, 128522 + ... + 129180.

It is an arithmetic number, because the mean of its divisors is an integer number (10692000).

Almost surely, 2^84912809 is an apocalyptic number.

It is an amenable number.

84912809 is a deficient number, since it is larger than the sum of its proper divisors (623191).

84912809 is a wasteful number, since it uses less digits than its factorization.

84912809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 84912809 is about 9214.8146481630. The cubic root of 84912809 is about 439.5325769677.

The spelling of 84912809 in words is "eighty-four million, nine hundred twelve thousand, eight hundred nine".