128232439 has 4 divisors (see below), whose sum is σ = 130146424. Its totient is φ = 126318456.

The previous prime is 128232437. The next prime is 128232449. The reversal of 128232439 is 934232821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934232821 = 7043 ⋅132647.

It is a cyclic number.

It is not a de Polignac number, because 128232439 - 2¹ = 128232437 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 (128232437) 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, 956892 + ... + 957025.

It is an arithmetic number, because the mean of its divisors is an integer number (32536606).

Almost surely, 2^128232439 is an apocalyptic number.

128232439 is a deficient number, since it is larger than the sum of its proper divisors (1913985).

128232439 is an equidigital number, since it uses as much as digits as its factorization.

128232439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913984.

The product of its digits is 20736, while the sum is 34.

The square root of 128232439 is about 11323.9762892722. The cubic root of 128232439 is about 504.2732925617.

The spelling of 128232439 in words is "one hundred twenty-eight million, two hundred thirty-two thousand, four hundred thirty-nine".