128432739 has 8 divisors (see below), whose sum is σ = 181316880. Its totient is φ = 80585216.

The previous prime is 128432729. The next prime is 128432767. The reversal of 128432739 is 937234821.

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

It is a cyclic number.

It is not a de Polignac number, because 128432739 - 2²⁰ = 127384163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128432697 and 128432706.

It is not an unprimeable number, because it can be changed into a prime (128432719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1259094 + ... + 1259195.

It is an arithmetic number, because the mean of its divisors is an integer number (22664610).

Almost surely, 2^128432739 is an apocalyptic number.

128432739 is a deficient number, since it is larger than the sum of its proper divisors (52884141).

128432739 is a wasteful number, since it uses less digits than its factorization.

128432739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518309.

The product of its digits is 72576, while the sum is 39.

The square root of 128432739 is about 11332.8169049006. The cubic root of 128432739 is about 504.5357154874.

The spelling of 128432739 in words is "one hundred twenty-eight million, four hundred thirty-two thousand, seven hundred thirty-nine".