86438521 has 4 divisors (see below), whose sum is σ = 93087652. Its totient is φ = 79789392.

The previous prime is 86438519. The next prime is 86438533. The reversal of 86438521 is 12583468.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7868025 + 78570496 = 2805^2 + 8864^2 .

It is a cyclic number.

It is not a de Polignac number, because 86438521 - 2¹ = 86438519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86438021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3324546 + ... + 3324571.

It is an arithmetic number, because the mean of its divisors is an integer number (23271913).

Almost surely, 2^86438521 is an apocalyptic number.

It is an amenable number.

86438521 is a deficient number, since it is larger than the sum of its proper divisors (6649131).

86438521 is a wasteful number, since it uses less digits than its factorization.

86438521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6649130.

The product of its digits is 46080, while the sum is 37.

The square root of 86438521 is about 9297.2318998721. The cubic root of 86438521 is about 442.1494703425.

The spelling of 86438521 in words is "eighty-six million, four hundred thirty-eight thousand, five hundred twenty-one".