128456143 has 4 divisors (see below), whose sum is σ = 129728088. Its totient is φ = 127184200.

The previous prime is 128456137. The next prime is 128456161. The reversal of 128456143 is 341654821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128456143 - 2⁹ = 128455631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128456099 and 128456108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128456113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635821 + ... + 636022.

It is an arithmetic number, because the mean of its divisors is an integer number (32432022).

Almost surely, 2^128456143 is an apocalyptic number.

128456143 is a deficient number, since it is larger than the sum of its proper divisors (1271945).

128456143 is a wasteful number, since it uses less digits than its factorization.

128456143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271944.

The product of its digits is 23040, while the sum is 34.

The square root of 128456143 is about 11333.8494343272. The cubic root of 128456143 is about 504.5663604169.

The spelling of 128456143 in words is "one hundred twenty-eight million, four hundred fifty-six thousand, one hundred forty-three".