128039145 has 64 divisors (see below), whose sum is σ = 232243200. Its totient is φ = 59800320.

The previous prime is 128039143. The next prime is 128039161. The reversal of 128039145 is 541930821.

It is not a de Polignac number, because 128039145 - 2¹ = 128039143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128039141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 356476 + ... + 356834.

It is an arithmetic number, because the mean of its divisors is an integer number (3628800).

Almost surely, 2^128039145 is an apocalyptic number.

128039145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128039145 is a deficient number, since it is larger than the sum of its proper divisors (104204055).

128039145 is a wasteful number, since it uses less digits than its factorization.

128039145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 128039145 is about 11315.4383476735. The cubic root of 128039145 is about 504.0197893149.

Adding to 128039145 its reverse (541930821), we get a palindrome (669969966).

The spelling of 128039145 in words is "one hundred twenty-eight million, thirty-nine thousand, one hundred forty-five".