83963821 has 4 divisors (see below), whose sum is σ = 85916512. Its totient is φ = 82011132.

The previous prime is 83963809. The next prime is 83963827. The reversal of 83963821 is 12836938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83963821 - 2¹⁵ = 83931053 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 (83963827) 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 3 ways as a sum of consecutive naturals, for example, 976281 + ... + 976366.

It is an arithmetic number, because the mean of its divisors is an integer number (21479128).

Almost surely, 2^83963821 is an apocalyptic number.

It is an amenable number.

83963821 is a deficient number, since it is larger than the sum of its proper divisors (1952691).

83963821 is a wasteful number, since it uses less digits than its factorization.

83963821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952690.

The product of its digits is 62208, while the sum is 40.

The square root of 83963821 is about 9163.1774510810. The cubic root of 83963821 is about 437.8890293157.

The spelling of 83963821 in words is "eighty-three million, nine hundred sixty-three thousand, eight hundred twenty-one".