84321729 has 12 divisors (see below), whose sum is σ = 126309456. Its totient is φ = 56214324.

The previous prime is 84321701. The next prime is 84321737. The reversal of 84321729 is 92712348.

It is not a de Polignac number, because 84321729 - 2⁵ = 84321697 is a prime.

It is a super-2 number, since 2×84321729² = 14220307963098882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84321693 and 84321702.

It is not an unprimeable number, because it can be changed into a prime (84321739) 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 11 ways as a sum of consecutive naturals, for example, 173259 + ... + 173744.

It is an arithmetic number, because the mean of its divisors is an integer number (10525788).

Almost surely, 2^84321729 is an apocalyptic number.

It is an amenable number.

84321729 is a deficient number, since it is larger than the sum of its proper divisors (41987727).

84321729 is an equidigital number, since it uses as much as digits as its factorization.

84321729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347018 (or 347006 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 84321729 is about 9182.6863716453. The cubic root of 84321729 is about 438.5103359072.

The spelling of 84321729 in words is "eighty-four million, three hundred twenty-one thousand, seven hundred twenty-nine".