86439231 has 12 divisors (see below), whose sum is σ = 129481352. Its totient is φ = 57625992.

The previous prime is 86439211. The next prime is 86439233. The reversal of 86439231 is 13293468.

86439231 is a `hidden beast` number, since 8 + 643 + 9 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 86439231 - 2⁶ = 86439167 is a prime.

It is a super-2 number, since 2×86439231² = 14943481311742722, 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 (86439233) 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 11 ways as a sum of consecutive naturals, for example, 177616 + ... + 178101.

Almost surely, 2^86439231 is an apocalyptic number.

86439231 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

86439231 is a deficient number, since it is larger than the sum of its proper divisors (43042121).

86439231 is an equidigital number, since it uses as much as digits as its factorization.

86439231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355732 (or 355720 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 86439231 is about 9297.2700832018. The cubic root of 86439231 is about 442.1506809342.

The spelling of 86439231 in words is "eighty-six million, four hundred thirty-nine thousand, two hundred thirty-one".