84729821 has 8 divisors (see below), whose sum is σ = 94687488. Its totient is φ = 75148000.

The previous prime is 84729817. The next prime is 84729833. The reversal of 84729821 is 12892748.

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 84729821 - 2² = 84729817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84722821) 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, 93485 + ... + 94386.

It is an arithmetic number, because the mean of its divisors is an integer number (11835936).

Almost surely, 2^84729821 is an apocalyptic number.

It is an amenable number.

84729821 is a deficient number, since it is larger than the sum of its proper divisors (9957667).

84729821 is a wasteful number, since it uses less digits than its factorization.

84729821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187923.

The product of its digits is 64512, while the sum is 41.

The square root of 84729821 is about 9204.8802816767. The cubic root of 84729821 is about 439.2166174454.

The spelling of 84729821 in words is "eighty-four million, seven hundred twenty-nine thousand, eight hundred twenty-one".