128744399 has 8 divisors (see below), whose sum is σ = 154880640. Its totient is φ = 104544216.

The previous prime is 128744389. The next prime is 128744411. The reversal of 128744399 is 993447821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128744399 - 2²⁴ = 111967183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128744309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483869 + ... + 484134.

It is an arithmetic number, because the mean of its divisors is an integer number (19360080).

Almost surely, 2^128744399 is an apocalyptic number.

128744399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128744399 is a deficient number, since it is larger than the sum of its proper divisors (26136241).

128744399 is an equidigital number, since it uses as much as digits as its factorization.

128744399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968029.

The product of its digits is 435456, while the sum is 47.

The square root of 128744399 is about 11346.5589056771. The cubic root of 128744399 is about 504.9434946417.

The spelling of 128744399 in words is "one hundred twenty-eight million, seven hundred forty-four thousand, three hundred ninety-nine".