128396069 has 2 divisors, whose sum is σ = 128396070. Its totient is φ = 128396068.

The previous prime is 128396029. The next prime is 128396101. The reversal of 128396069 is 960693821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119093569 + 9302500 = 10913^2 + 3050^2 .

It is an emirp because it is prime and its reverse (960693821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128396069 - 2²⁴ = 111618853 is a prime.

It is a super-2 number, since 2×128396069² = 32971101069305522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128396029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64198034 + 64198035.

It is an arithmetic number, because the mean of its divisors is an integer number (64198035).

Almost surely, 2^128396069 is an apocalyptic number.

It is an amenable number.

128396069 is a deficient number, since it is larger than the sum of its proper divisors (1).

128396069 is an equidigital number, since it uses as much as digits as its factorization.

128396069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 128396069 is about 11331.1989215617. The cubic root of 128396069 is about 504.4876927222.

The spelling of 128396069 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, sixty-nine".