86440 has 16 divisors (see below), whose sum is σ = 194580. Its totient is φ = 34560.

The previous prime is 86423. The next prime is 86441. The reversal of 86440 is 4468.

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 4 = 294^2 + 2^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (86441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041 + ... + 1120.

2⁸⁶⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

86440 is an abundant number, since it is smaller than the sum of its proper divisors (108140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97290).

86440 is a wasteful number, since it uses less digits than its factorization.

86440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 86440 is about 294.0068026424. The cubic root of 86440 is about 44.2151992117.

The spelling of 86440 in words is "eighty-six thousand, four hundred forty".