128388433 has 2 divisors, whose sum is σ = 128388434. Its totient is φ = 128388432.

The previous prime is 128388413. The next prime is 128388439. The reversal of 128388433 is 334883821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73153809 + 55234624 = 8553^2 + 7432^2 .

It is a cyclic number.

It is not a de Polignac number, because 128388433 - 2²¹ = 126291281 is a prime.

It is not a weakly prime, because it can be changed into another prime (128388439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64194216 + 64194217.

It is an arithmetic number, because the mean of its divisors is an integer number (64194217).

Almost surely, 2^128388433 is an apocalyptic number.

It is an amenable number.

128388433 is a deficient number, since it is larger than the sum of its proper divisors (1).

128388433 is an equidigital number, since it uses as much as digits as its factorization.

128388433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 40.

The square root of 128388433 is about 11330.8619707417. The cubic root of 128388433 is about 504.4776915220.

It can be divided in two parts, 128388 and 433, that added together give a palindrome (128821).

The spelling of 128388433 in words is "one hundred twenty-eight million, three hundred eighty-eight thousand, four hundred thirty-three".