86857389 has 24 divisors (see below), whose sum is σ = 130228280. Its totient is φ = 55738368.

The previous prime is 86857387. The next prime is 86857391. The reversal of 86857389 is 98375868.

It is a happy number.

86857389 is a `hidden beast` number, since 8 + 68 + 573 + 8 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (86857387) and next prime (86857391).

It can be written as a sum of positive squares in 4 ways, for example, as 7469289 + 79388100 = 2733^2 + 8910^2 .

It is not a de Polignac number, because 86857389 - 2¹ = 86857387 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86857387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30957 + ... + 33645.

Almost surely, 2^86857389 is an apocalyptic number.

It is an amenable number.

86857389 is a deficient number, since it is larger than the sum of its proper divisors (43370891).

86857389 is a wasteful number, since it uses less digits than its factorization.

86857389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2829 (or 2826 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 86857389 is about 9319.7311656506. The cubic root of 86857389 is about 442.8625162967.

The spelling of 86857389 in words is "eighty-six million, eight hundred fifty-seven thousand, three hundred eighty-nine".