128012919 has 16 divisors (see below), whose sum is σ = 177100800. Its totient is φ = 82162080.

The previous prime is 128012909. The next prime is 128012957. The reversal of 128012919 is 919210821.

It is not a de Polignac number, because 128012919 - 2⁹ = 128012407 is a prime.

It is a super-2 number, since 2×128012919² = 32774614861801122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128012919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128012909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15049 + ... + 21965.

It is an arithmetic number, because the mean of its divisors is an integer number (11068800).

Almost surely, 2^128012919 is an apocalyptic number.

128012919 is a deficient number, since it is larger than the sum of its proper divisors (49087881).

128012919 is a wasteful number, since it uses less digits than its factorization.

128012919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 128012919 is about 11314.2794291108. The cubic root of 128012919 is about 503.9853745126.

The spelling of 128012919 in words is "one hundred twenty-eight million, twelve thousand, nine hundred nineteen".