84221785 has 8 divisors (see below), whose sum is σ = 102723336. Its totient is φ = 66272640.

The previous prime is 84221783. The next prime is 84221807. The reversal of 84221785 is 58712248.

It can be written as a sum of positive squares in 4 ways, for example, as 10055241 + 74166544 = 3171^2 + 8612^2 .

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

It is not a de Polignac number, because 84221785 - 2¹ = 84221783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84221783) 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 7 ways as a sum of consecutive naturals, for example, 137764 + ... + 138373.

It is an arithmetic number, because the mean of its divisors is an integer number (12840417).

Almost surely, 2^84221785 is an apocalyptic number.

It is an amenable number.

84221785 is a deficient number, since it is larger than the sum of its proper divisors (18501551).

84221785 is a wasteful number, since it uses less digits than its factorization.

84221785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276203.

The product of its digits is 35840, while the sum is 37.

The square root of 84221785 is about 9177.2427776539. The cubic root of 84221785 is about 438.3370163910.

The spelling of 84221785 in words is "eighty-four million, two hundred twenty-one thousand, seven hundred eighty-five".