128933993 has 2 divisors, whose sum is σ = 128933994. Its totient is φ = 128933992.

The previous prime is 128933983. The next prime is 128934007. The reversal of 128933993 is 399339821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104203264 + 24730729 = 10208^2 + 4973^2 .

It is a cyclic number.

It is not a de Polignac number, because 128933993 - 2¹² = 128929897 is a prime.

It is not a weakly prime, because it can be changed into another prime (128933923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64466996 + 64466997.

It is an arithmetic number, because the mean of its divisors is an integer number (64466997).

Almost surely, 2^128933993 is an apocalyptic number.

It is an amenable number.

128933993 is a deficient number, since it is larger than the sum of its proper divisors (1).

128933993 is an equidigital number, since it uses as much as digits as its factorization.

128933993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 128933993 is about 11354.9105236457. The cubic root of 128933993 is about 505.1912395328.

The spelling of 128933993 in words is "one hundred twenty-eight million, nine hundred thirty-three thousand, nine hundred ninety-three".