84994821 has 24 divisors (see below), whose sum is σ = 129317760. Its totient is φ = 53688096.

The previous prime is 84994813. The next prime is 84994823. The reversal of 84994821 is 12849948.

84994821 is a `hidden beast` number, since 84 + 99 + 482 + 1 = 666.

It is not a de Polignac number, because 84994821 - 2³ = 84994813 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 (84994823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20680 + ... + 24446.

It is an arithmetic number, because the mean of its divisors is an integer number (5388240).

Almost surely, 2^84994821 is an apocalyptic number.

It is an amenable number.

84994821 is a deficient number, since it is larger than the sum of its proper divisors (44322939).

84994821 is a wasteful number, since it uses less digits than its factorization.

84994821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905 (or 3902 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 84994821 is about 9219.2635823042. The cubic root of 84994821 is about 439.6740371596.

The spelling of 84994821 in words is "eighty-four million, nine hundred ninety-four thousand, eight hundred twenty-one".