128443457 has 2 divisors, whose sum is σ = 128443458. Its totient is φ = 128443456.

The previous prime is 128443453. The next prime is 128443459. The reversal of 128443457 is 754344821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91853056 + 36590401 = 9584^2 + 6049^2 .

It is a cyclic number.

It is not a de Polignac number, because 128443457 - 2² = 128443453 is a prime.

It is a super-2 number, since 2×128443457² = 32995443292221698, which contains 22 as substring.

Together with 128443459, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128443457.

It is not a weakly prime, because it can be changed into another prime (128443453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64221728 + 64221729.

It is an arithmetic number, because the mean of its divisors is an integer number (64221729).

Almost surely, 2^128443457 is an apocalyptic number.

It is an amenable number.

128443457 is a deficient number, since it is larger than the sum of its proper divisors (1).

128443457 is an equidigital number, since it uses as much as digits as its factorization.

128443457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 38.

The square root of 128443457 is about 11333.2897695241. The cubic root of 128443457 is about 504.5497499759.

The spelling of 128443457 in words is "one hundred twenty-eight million, four hundred forty-three thousand, four hundred fifty-seven".