128433427 has 4 divisors (see below), whose sum is σ = 129570120. Its totient is φ = 127296736.

The previous prime is 128433413. The next prime is 128433433. The reversal of 128433427 is 724334821.

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 128433427 - 2⁷ = 128433299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128433392 and 128433401.

It is not an unprimeable number, because it can be changed into a prime (128433457) 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 3 ways as a sum of consecutive naturals, for example, 568177 + ... + 568402.

It is an arithmetic number, because the mean of its divisors is an integer number (32392530).

Almost surely, 2^128433427 is an apocalyptic number.

128433427 is a deficient number, since it is larger than the sum of its proper divisors (1136693).

128433427 is a wasteful number, since it uses less digits than its factorization.

128433427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136692.

The product of its digits is 32256, while the sum is 34.

The square root of 128433427 is about 11332.8472591843. The cubic root of 128433427 is about 504.5366163998.

The spelling of 128433427 in words is "one hundred twenty-eight million, four hundred thirty-three thousand, four hundred twenty-seven".