128232905 has 4 divisors (see below), whose sum is σ = 153879492. Its totient is φ = 102586320.

The previous prime is 128232883. The next prime is 128232911. The reversal of 128232905 is 509232821.

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: 509232821 = 181 ⋅2813441.

It can be written as a sum of positive squares in 2 ways, for example, as 54479161 + 73753744 = 7381^2 + 8588^2 .

It is not a de Polignac number, because 128232905 - 2¹² = 128228809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12823286 + ... + 12823295.

It is an arithmetic number, because the mean of its divisors is an integer number (38469873).

Almost surely, 2^128232905 is an apocalyptic number.

It is an amenable number.

128232905 is a deficient number, since it is larger than the sum of its proper divisors (25646587).

128232905 is an equidigital number, since it uses as much as digits as its factorization.

128232905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25646586.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 128232905 is about 11323.9968650649. The cubic root of 128232905 is about 504.2739034084.

The spelling of 128232905 in words is "one hundred twenty-eight million, two hundred thirty-two thousand, nine hundred five".