128139345 has 24 divisors (see below), whose sum is σ = 225754152. Its totient is φ = 67219200.

The previous prime is 128139331. The next prime is 128139373. The reversal of 128139345 is 543931821.

128139345 is a `hidden beast` number, since 1 + 281 + 39 + 345 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18455616 + 109683729 = 4296^2 + 10473^2 .

It is not a de Polignac number, because 128139345 - 2⁴ = 128139329 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20596 + ... + 26085.

It is an arithmetic number, because the mean of its divisors is an integer number (9406423).

Almost surely, 2^128139345 is an apocalyptic number.

128139345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128139345 is a deficient number, since it is larger than the sum of its proper divisors (97614807).

128139345 is a wasteful number, since it uses less digits than its factorization.

128139345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46753 (or 46750 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 128139345 is about 11319.8650610332. The cubic root of 128139345 is about 504.1512324882.

The spelling of 128139345 in words is "one hundred twenty-eight million, one hundred thirty-nine thousand, three hundred forty-five".