86138389 has 2 divisors, whose sum is σ = 86138390. Its totient is φ = 86138388.

The previous prime is 86138387. The next prime is 86138401. The reversal of 86138389 is 98383168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73393489 + 12744900 = 8567^2 + 3570^2 .

It is a cyclic number.

It is not a de Polignac number, because 86138389 - 2¹ = 86138387 is a prime.

Together with 86138387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86138387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43069194 + 43069195.

It is an arithmetic number, because the mean of its divisors is an integer number (43069195).

Almost surely, 2^86138389 is an apocalyptic number.

It is an amenable number.

86138389 is a deficient number, since it is larger than the sum of its proper divisors (1).

86138389 is an equidigital number, since it uses as much as digits as its factorization.

86138389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 86138389 is about 9281.0769310463. The cubic root of 86138389 is about 441.6371328220.

The spelling of 86138389 in words is "eighty-six million, one hundred thirty-eight thousand, three hundred eighty-nine".