84604909 has 4 divisors (see below), whose sum is σ = 85250880. Its totient is φ = 83958940.

The previous prime is 84604901. The next prime is 84604939. The reversal of 84604909 is 90940648.

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 84604909 - 2³ = 84604901 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84604901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322789 + ... + 323050.

It is an arithmetic number, because the mean of its divisors is an integer number (21312720).

Almost surely, 2^84604909 is an apocalyptic number.

It is an amenable number.

84604909 is a deficient number, since it is larger than the sum of its proper divisors (645971).

84604909 is a wasteful number, since it uses less digits than its factorization.

84604909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645970.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 84604909 is about 9198.0926827250. The cubic root of 84604909 is about 439.0006745492. Note that the first 3 decimals are identical.

The spelling of 84604909 in words is "eighty-four million, six hundred four thousand, nine hundred nine".