84293821 has 2 divisors, whose sum is σ = 84293822. Its totient is φ = 84293820.

The previous prime is 84293791. The next prime is 84293863. The reversal of 84293821 is 12839248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83265625 + 1028196 = 9125^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 84293821 - 2⁵ = 84293789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84293221) 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 as a sum of consecutive naturals, namely, 42146910 + 42146911.

It is an arithmetic number, because the mean of its divisors is an integer number (42146911).

Almost surely, 2^84293821 is an apocalyptic number.

It is an amenable number.

84293821 is a deficient number, since it is larger than the sum of its proper divisors (1).

84293821 is an equidigital number, since it uses as much as digits as its factorization.

84293821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 84293821 is about 9181.1666470008. The cubic root of 84293821 is about 438.4619525823.

The spelling of 84293821 in words is "eighty-four million, two hundred ninety-three thousand, eight hundred twenty-one".