128382797 has 4 divisors (see below), whose sum is σ = 132809820. Its totient is φ = 123955776.

The previous prime is 128382731. The next prime is 128382799. The reversal of 128382797 is 797283821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797283821 = 173 ⋅4608577.

It can be written as a sum of positive squares in 2 ways, for example, as 102839881 + 25542916 = 10141^2 + 5054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128382797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128382799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213468 + ... + 2213525.

It is an arithmetic number, because the mean of its divisors is an integer number (33202455).

Almost surely, 2^128382797 is an apocalyptic number.

It is an amenable number.

128382797 is a deficient number, since it is larger than the sum of its proper divisors (4427023).

128382797 is an equidigital number, since it uses as much as digits as its factorization.

128382797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427022.

The product of its digits is 338688, while the sum is 47.

The square root of 128382797 is about 11330.6132667213. The cubic root of 128382797 is about 504.4703095541.

The spelling of 128382797 in words is "one hundred twenty-eight million, three hundred eighty-two thousand, seven hundred ninety-seven".