86390721 has 12 divisors (see below), whose sum is σ = 125197072. Its totient is φ = 57404376.

The previous prime is 86390659. The next prime is 86390729. The reversal of 86390721 is 12709368.

It is not a de Polignac number, because 86390721 - 2⁷ = 86390593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86390729) 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 11 ways as a sum of consecutive naturals, for example, 12871 + ... + 18396.

Almost surely, 2^86390721 is an apocalyptic number.

It is an amenable number.

86390721 is a deficient number, since it is larger than the sum of its proper divisors (38806351).

86390721 is a wasteful number, since it uses less digits than its factorization.

86390721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31580 (or 31577 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 86390721 is about 9294.6608867672. The cubic root of 86390721 is about 442.0679532850.

The spelling of 86390721 in words is "eighty-six million, three hundred ninety thousand, seven hundred twenty-one".