128899841 has 6 divisors (see below), whose sum is σ = 149944770. Its totient is φ = 110485536.

The previous prime is 128899811. The next prime is 128899871. The reversal of 128899841 is 148998821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128899811) and next prime (128899871).

It can be written as a sum of positive squares in only one way, i.e., 92236816 + 36663025 = 9604^2 + 6055^2 .

It is not a de Polignac number, because 128899841 - 2¹⁰ = 128898817 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 128899841.

It is not an unprimeable number, because it can be changed into a prime (128899811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1315256 + ... + 1315353.

It is an arithmetic number, because the mean of its divisors is an integer number (24990795).

Almost surely, 2^128899841 is an apocalyptic number.

It is an amenable number.

128899841 is a deficient number, since it is larger than the sum of its proper divisors (21044929).

128899841 is an equidigital number, since it uses as much as digits as its factorization.

128899841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630623 (or 2630616 counting only the distinct ones).

The product of its digits is 331776, while the sum is 50.

The square root of 128899841 is about 11353.4065812865. The cubic root of 128899841 is about 505.1466306225.

The spelling of 128899841 in words is "one hundred twenty-eight million, eight hundred ninety-nine thousand, eight hundred forty-one".