13128889 has 8 divisors (see below), whose sum is σ = 13571712. Its totient is φ = 12692400.

The previous prime is 13128877. The next prime is 13128901. The reversal of 13128889 is 98882131.

It is an interprime number because it is at equal distance from previous prime (13128877) and next prime (13128901).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13128889 - 2⁷ = 13128761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13128809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2832 + ... + 5854.

It is an arithmetic number, because the mean of its divisors is an integer number (1696464).

Almost surely, 2^13128889 is an apocalyptic number.

It is an amenable number.

13128889 is a deficient number, since it is larger than the sum of its proper divisors (442823).

13128889 is a wasteful number, since it uses less digits than its factorization.

13128889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167.

The product of its digits is 27648, while the sum is 40.

The square root of 13128889 is about 3623.3808797862. The cubic root of 13128889 is about 235.9079946350.

It can be divided in two parts, 1312 and 8889, that added together give a palindrome (10201).

The spelling of 13128889 in words is "thirteen million, one hundred twenty-eight thousand, eight hundred eighty-nine".