128845387 has 4 divisors (see below), whose sum is σ = 140558616. Its totient is φ = 117132160.

The previous prime is 128845373. The next prime is 128845399. The reversal of 128845387 is 783548821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128845387 - 2¹⁹ = 128321099 is a prime.

It is a super-2 number, since 2×128845387² = 33202267502359538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128845307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5856598 + ... + 5856619.

It is an arithmetic number, because the mean of its divisors is an integer number (35139654).

Almost surely, 2^128845387 is an apocalyptic number.

128845387 is a deficient number, since it is larger than the sum of its proper divisors (11713229).

128845387 is a wasteful number, since it uses less digits than its factorization.

128845387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11713228.

The product of its digits is 430080, while the sum is 46.

The square root of 128845387 is about 11351.0081931078. The cubic root of 128845387 is about 505.0754871962.

The spelling of 128845387 in words is "one hundred twenty-eight million, eight hundred forty-five thousand, three hundred eighty-seven".