86378489 has 2 divisors, whose sum is σ = 86378490. Its totient is φ = 86378488.

The previous prime is 86378437. The next prime is 86378519. The reversal of 86378489 is 98487368.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72931600 + 13446889 = 8540^2 + 3667^2 .

It is a cyclic number.

It is not a de Polignac number, because 86378489 - 2⁸ = 86378233 is a prime.

It is a super-2 number, since 2×86378489² = 14922486723846242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86378489.

It is not a weakly prime, because it can be changed into another prime (86378189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43189244 + 43189245.

It is an arithmetic number, because the mean of its divisors is an integer number (43189245).

Almost surely, 2^86378489 is an apocalyptic number.

It is an amenable number.

86378489 is a deficient number, since it is larger than the sum of its proper divisors (1).

86378489 is an equidigital number, since it uses as much as digits as its factorization.

86378489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 53.

The square root of 86378489 is about 9294.0028513015. The cubic root of 86378489 is about 442.0470882724.

Subtracting from 86378489 its sum of digits (53), we obtain a square (86378436 = 9294²).

The spelling of 86378489 in words is "eighty-six million, three hundred seventy-eight thousand, four hundred eighty-nine".