8857487389 has 2 divisors, whose sum is σ = 8857487390. Its totient is φ = 8857487388.

The previous prime is 8857487293. The next prime is 8857487423. The reversal of 8857487389 is 9837847588.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7816328100 + 1041159289 = 88410^2 + 32267^2 .

It is a cyclic number.

It is not a de Polignac number, because 8857487389 - 2¹⁵ = 8857454621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8857487489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4428743694 + 4428743695.

It is an arithmetic number, because the mean of its divisors is an integer number (4428743695).

Almost surely, 2^8857487389 is an apocalyptic number.

It is an amenable number.

8857487389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8857487389 is an equidigital number, since it uses as much as digits as its factorization.

8857487389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108380160, while the sum is 67.

The square root of 8857487389 is about 94114.2252212703. The cubic root of 8857487389 is about 2069.0461652162.

The spelling of 8857487389 in words is "eight billion, eight hundred fifty-seven million, four hundred eighty-seven thousand, three hundred eighty-nine".