83406821 has 8 divisors (see below), whose sum is σ = 84486240. Its totient is φ = 82333168.

The previous prime is 83406749. The next prime is 83406839. The reversal of 83406821 is 12860438.

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

It is a cyclic number.

It is not a de Polignac number, because 83406821 - 2²² = 79212517 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 (83406121) 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 7 ways as a sum of consecutive naturals, for example, 32690 + ... + 35148.

It is an arithmetic number, because the mean of its divisors is an integer number (10560780).

Almost surely, 2^83406821 is an apocalyptic number.

It is an amenable number.

83406821 is a deficient number, since it is larger than the sum of its proper divisors (1079419).

83406821 is a wasteful number, since it uses less digits than its factorization.

83406821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 83406821 is about 9132.7334900346. The cubic root of 83406821 is about 436.9185894249.

The spelling of 83406821 in words is "eighty-three million, four hundred six thousand, eight hundred twenty-one".