128845399 has 2 divisors, whose sum is σ = 128845400. Its totient is φ = 128845398.

The previous prime is 128845373. The next prime is 128845421. The reversal of 128845399 is 993548821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128845399 - 2⁷ = 128845271 is a prime.

It is a super-2 number, since 2×128845399² = 33202273686938402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128845309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64422699 + 64422700.

It is an arithmetic number, because the mean of its divisors is an integer number (64422700).

Almost surely, 2^128845399 is an apocalyptic number.

128845399 is a deficient number, since it is larger than the sum of its proper divisors (1).

128845399 is an equidigital number, since it uses as much as digits as its factorization.

128845399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The square root of 128845399 is about 11351.0087216952. The cubic root of 128845399 is about 505.0755028762.

The spelling of 128845399 in words is "one hundred twenty-eight million, eight hundred forty-five thousand, three hundred ninety-nine".