86139421 has 12 divisors (see below), whose sum is σ = 90410880. Its totient is φ = 81983880.

The previous prime is 86139409. The next prime is 86139437. The reversal of 86139421 is 12493168.

It is not a de Polignac number, because 86139421 - 2¹³ = 86131229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86139481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138850 + ... + 139468.

It is an arithmetic number, because the mean of its divisors is an integer number (7534240).

Almost surely, 2^86139421 is an apocalyptic number.

It is an amenable number.

86139421 is a deficient number, since it is larger than the sum of its proper divisors (4271459).

86139421 is an equidigital number, since it uses as much as digits as its factorization.

86139421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784 (or 717 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 86139421 is about 9281.1325278761. The cubic root of 86139421 is about 441.6388965254.

The spelling of 86139421 in words is "eighty-six million, one hundred thirty-nine thousand, four hundred twenty-one".