84004805 has 4 divisors (see below), whose sum is σ = 100805772. Its totient is φ = 67203840.

The previous prime is 84004799. The next prime is 84004807. The reversal of 84004805 is 50840048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11175649 + 72829156 = 3343^2 + 8534^2 .

It is not a de Polignac number, because 84004805 - 2⁶ = 84004741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84004807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8400476 + ... + 8400485.

It is an arithmetic number, because the mean of its divisors is an integer number (25201443).

Almost surely, 2^84004805 is an apocalyptic number.

It is an amenable number.

84004805 is a deficient number, since it is larger than the sum of its proper divisors (16800967).

84004805 is a wasteful number, since it uses less digits than its factorization.

84004805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16800966.

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 84004805 is about 9165.4135204038. The cubic root of 84004805 is about 437.9602644603.

The spelling of 84004805 in words is "eighty-four million, four thousand, eight hundred five".