128638963 has 2 divisors, whose sum is σ = 128638964. Its totient is φ = 128638962.

The previous prime is 128638943. The next prime is 128638969. The reversal of 128638963 is 369836821.

It is a strong prime.

It is an emirp because it is prime and its reverse (369836821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128638963 - 2¹⁷ = 128507891 is a prime.

It is not a weakly prime, because it can be changed into another prime (128638969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64319481 + 64319482.

It is an arithmetic number, because the mean of its divisors is an integer number (64319482).

Almost surely, 2^128638963 is an apocalyptic number.

128638963 is a deficient number, since it is larger than the sum of its proper divisors (1).

128638963 is an equidigital number, since it uses as much as digits as its factorization.

128638963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 46.

The square root of 128638963 is about 11341.9117877014. The cubic root of 128638963 is about 504.8056148249.

The spelling of 128638963 in words is "one hundred twenty-eight million, six hundred thirty-eight thousand, nine hundred sixty-three".