128885389 has 2 divisors, whose sum is σ = 128885390. Its totient is φ = 128885388.

The previous prime is 128885371. The next prime is 128885411. The reversal of 128885389 is 983588821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117896164 + 10989225 = 10858^2 + 3315^2 .

It is an emirp because it is prime and its reverse (983588821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128885389 - 2⁵ = 128885357 is a prime.

It is a super-2 number, since 2×128885389² = 33222886995362642, which contains 22 as substring.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64442694 + 64442695.

It is an arithmetic number, because the mean of its divisors is an integer number (64442695).

Almost surely, 2^128885389 is an apocalyptic number.

It is an amenable number.

128885389 is a deficient number, since it is larger than the sum of its proper divisors (1).

128885389 is an equidigital number, since it uses as much as digits as its factorization.

128885389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1105920, while the sum is 52.

The square root of 128885389 is about 11352.7701024904. The cubic root of 128885389 is about 505.1277512303.

The spelling of 128885389 in words is "one hundred twenty-eight million, eight hundred eighty-five thousand, three hundred eighty-nine".