84823821 has 16 divisors (see below), whose sum is σ = 128589120. Its totient is φ = 55233360.

The previous prime is 84823807. The next prime is 84823831. The reversal of 84823821 is 12832848.

It is a happy number.

It is not a de Polignac number, because 84823821 - 2⁶ = 84823757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84823831) 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 15 ways as a sum of consecutive naturals, for example, 35370 + ... + 37691.

It is an arithmetic number, because the mean of its divisors is an integer number (8036820).

Almost surely, 2^84823821 is an apocalyptic number.

It is an amenable number.

84823821 is a deficient number, since it is larger than the sum of its proper divisors (43765299).

84823821 is a wasteful number, since it uses less digits than its factorization.

84823821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73113 (or 73107 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 84823821 is about 9209.9848534077. The cubic root of 84823821 is about 439.3789809956.

The spelling of 84823821 in words is "eighty-four million, eight hundred twenty-three thousand, eight hundred twenty-one".