83347821 has 12 divisors (see below), whose sum is σ = 127473372. Its totient is φ = 52296576.

The previous prime is 83347801. The next prime is 83347829. The reversal of 83347821 is 12874338.

It can be written as a sum of positive squares in 2 ways, for example, as 40182921 + 43164900 = 6339^2 + 6570^2 .

It is not a de Polignac number, because 83347821 - 2¹³ = 83339629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83347829) 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 11 ways as a sum of consecutive naturals, for example, 272226 + ... + 272531.

It is an arithmetic number, because the mean of its divisors is an integer number (10622781).

Almost surely, 2^83347821 is an apocalyptic number.

It is an amenable number.

83347821 is a deficient number, since it is larger than the sum of its proper divisors (44125551).

83347821 is a wasteful number, since it uses less digits than its factorization.

83347821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544780 (or 544777 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 83347821 is about 9129.5027794508. The cubic root of 83347821 is about 436.8155431866.

The spelling of 83347821 in words is "eighty-three million, three hundred forty-seven thousand, eight hundred twenty-one".