83639421 has 6 divisors (see below), whose sum is σ = 120812510. Its totient is φ = 55759608.

The previous prime is 83639419. The next prime is 83639447. The reversal of 83639421 is 12493638.

It can be written as a sum of positive squares in only one way, i.e., 69305625 + 14333796 = 8325^2 + 3786^2 .

It is not a de Polignac number, because 83639421 - 2¹ = 83639419 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 (83639401) 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 5 ways as a sum of consecutive naturals, for example, 4646626 + ... + 4646643.

Almost surely, 2^83639421 is an apocalyptic number.

It is an amenable number.

83639421 is a deficient number, since it is larger than the sum of its proper divisors (37173089).

83639421 is a wasteful number, since it uses less digits than its factorization.

83639421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9293275 (or 9293272 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 83639421 is about 9145.4590371397. The cubic root of 83639421 is about 437.3243633495.

The spelling of 83639421 in words is "eighty-three million, six hundred thirty-nine thousand, four hundred twenty-one".