128303999 has 2 divisors, whose sum is σ = 128304000. Its totient is φ = 128303998.

The previous prime is 128303977. The next prime is 128304019. The reversal of 128303999 is 999303821.

It is a strong prime.

It is an emirp because it is prime and its reverse (999303821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128303999 - 2²⁰ = 127255423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128303899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64151999 + 64152000.

It is an arithmetic number, because the mean of its divisors is an integer number (64152000).

Almost surely, 2^128303999 is an apocalyptic number.

128303999 is a deficient number, since it is larger than the sum of its proper divisors (1).

128303999 is an equidigital number, since it uses as much as digits as its factorization.

128303999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 128303999 is about 11327.1355160959. The cubic root of 128303999 is about 504.3670782076.

The spelling of 128303999 in words is "one hundred twenty-eight million, three hundred three thousand, nine hundred ninety-nine".