84312005 has 4 divisors (see below), whose sum is σ = 101174412. Its totient is φ = 67449600.

The previous prime is 84312001. The next prime is 84312017. The reversal of 84312005 is 50021348.

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 39929761 + 44382244 = 6319^2 + 6662^2 .

It is not a de Polignac number, because 84312005 - 2² = 84312001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84312001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8431196 + ... + 8431205.

It is an arithmetic number, because the mean of its divisors is an integer number (25293603).

Almost surely, 2^84312005 is an apocalyptic number.

It is an amenable number.

84312005 is a deficient number, since it is larger than the sum of its proper divisors (16862407).

84312005 is a wasteful number, since it uses less digits than its factorization.

84312005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16862406.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 84312005 is about 9182.1568816918. The cubic root of 84312005 is about 438.4934788903.

The spelling of 84312005 in words is "eighty-four million, three hundred twelve thousand, five".