128397311 has 16 divisors (see below), whose sum is σ = 156188736. Its totient is φ = 103036416.

The previous prime is 128397233. The next prime is 128397331. The reversal of 128397311 is 113793821.

It is a happy number.

It is not a de Polignac number, because 128397311 - 2¹⁰ = 128396287 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128397331) 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, 20705 + ... + 26181.

It is an arithmetic number, because the mean of its divisors is an integer number (9761796).

Almost surely, 2^128397311 is an apocalyptic number.

128397311 is a deficient number, since it is larger than the sum of its proper divisors (27791425).

128397311 is a wasteful number, since it uses less digits than its factorization.

128397311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5698.

The product of its digits is 9072, while the sum is 35.

The square root of 128397311 is about 11331.2537258681. The cubic root of 128397311 is about 504.4893193860.

The spelling of 128397311 in words is "one hundred twenty-eight million, three hundred ninety-seven thousand, three hundred eleven".