128396837 has 2 divisors, whose sum is σ = 128396838. Its totient is φ = 128396836.

The previous prime is 128396759. The next prime is 128396861. The reversal of 128396837 is 738693821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101626561 + 26770276 = 10081^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 128396837 - 2²⁰ = 127348261 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128396791 and 128396800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128396867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64198418 + 64198419.

It is an arithmetic number, because the mean of its divisors is an integer number (64198419).

Almost surely, 2^128396837 is an apocalyptic number.

It is an amenable number.

128396837 is a deficient number, since it is larger than the sum of its proper divisors (1).

128396837 is an equidigital number, since it uses as much as digits as its factorization.

128396837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 128396837 is about 11331.2328102462. The cubic root of 128396837 is about 504.4886985832.

The spelling of 128396837 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, eight hundred thirty-seven".