84821459 has 4 divisors (see below), whose sum is σ = 84843504. Its totient is φ = 84799416.

The previous prime is 84821441. The next prime is 84821507. The reversal of 84821459 is 95412848.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84821459 - 2⁸ = 84821203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84821419) 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, 3572 + ... + 13505.

It is an arithmetic number, because the mean of its divisors is an integer number (21210876).

Almost surely, 2^84821459 is an apocalyptic number.

84821459 is a deficient number, since it is larger than the sum of its proper divisors (22045).

84821459 is a wasteful number, since it uses less digits than its factorization.

84821459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22044.

The product of its digits is 92160, while the sum is 41.

The square root of 84821459 is about 9209.8566221196. The cubic root of 84821459 is about 439.3749026491.

The spelling of 84821459 in words is "eighty-four million, eight hundred twenty-one thousand, four hundred fifty-nine".