86447999 has 4 divisors (see below), whose sum is σ = 94306920. Its totient is φ = 78589080.

The previous prime is 86447989. The next prime is 86448001. The reversal of 86447999 is 99974468.

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 86447999 - 2⁸ = 86447743 is a prime.

It is a super-2 number, since 2×86447999² = 14946513062208002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86447909) 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 3 ways as a sum of consecutive naturals, for example, 3929444 + ... + 3929465.

It is an arithmetic number, because the mean of its divisors is an integer number (23576730).

Almost surely, 2^86447999 is an apocalyptic number.

86447999 is a deficient number, since it is larger than the sum of its proper divisors (7858921).

86447999 is a wasteful number, since it uses less digits than its factorization.

86447999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7858920.

The product of its digits is 3919104, while the sum is 56.

The square root of 86447999 is about 9297.7416075088. The cubic root of 86447999 is about 442.1656303426.

The spelling of 86447999 in words is "eighty-six million, four hundred forty-seven thousand, nine hundred ninety-nine".