86821869 has 16 divisors (see below), whose sum is σ = 120408320. Its totient is φ = 55598400.

The previous prime is 86821837. The next prime is 86821871. The reversal of 86821869 is 96812868.

It is not a de Polignac number, because 86821869 - 2⁵ = 86821837 is a prime.

It is a super-3 number, since 3×86821869³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (86826869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3819 + ... + 13719.

It is an arithmetic number, because the mean of its divisors is an integer number (7525520).

Almost surely, 2^86821869 is an apocalyptic number.

It is an amenable number.

86821869 is a deficient number, since it is larger than the sum of its proper divisors (33586451).

86821869 is a wasteful number, since it uses less digits than its factorization.

86821869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10020.

The product of its digits is 331776, while the sum is 48.

The square root of 86821869 is about 9317.8253364184. The cubic root of 86821869 is about 442.8021390832.

Subtracting 86821869 from its reverse (96812868), we obtain a palindrome (9990999).

The spelling of 86821869 in words is "eighty-six million, eight hundred twenty-one thousand, eight hundred sixty-nine".