128018747 has 4 divisors (see below), whose sum is σ = 132148416. Its totient is φ = 123889080.

The previous prime is 128018711. The next prime is 128018749. The reversal of 128018747 is 747810821.

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 128018747 - 2¹⁰ = 128017723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128018747.

It is not an unprimeable number, because it can be changed into a prime (128018749) 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, 2064788 + ... + 2064849.

It is an arithmetic number, because the mean of its divisors is an integer number (33037104).

Almost surely, 2^128018747 is an apocalyptic number.

128018747 is a deficient number, since it is larger than the sum of its proper divisors (4129669).

128018747 is an equidigital number, since it uses as much as digits as its factorization.

128018747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4129668.

The product of its (nonzero) digits is 25088, while the sum is 38.

The square root of 128018747 is about 11314.5369768276. The cubic root of 128018747 is about 503.9930226526.

The spelling of 128018747 in words is "one hundred twenty-eight million, eighteen thousand, seven hundred forty-seven".