128233399 has 4 divisors (see below), whose sum is σ = 146552464. Its totient is φ = 109914336.

The previous prime is 128233393. The next prime is 128233403. The reversal of 128233399 is 993332821.

It is a happy number.

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

It is not a de Polignac number, because 128233399 - 2¹¹ = 128231351 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 (128233393) 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, 9159522 + ... + 9159535.

It is an arithmetic number, because the mean of its divisors is an integer number (36638116).

Almost surely, 2^128233399 is an apocalyptic number.

128233399 is a deficient number, since it is larger than the sum of its proper divisors (18319065).

128233399 is an equidigital number, since it uses as much as digits as its factorization.

128233399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18319064.

The product of its digits is 69984, while the sum is 40.

The square root of 128233399 is about 11324.0186771305. The cubic root of 128233399 is about 504.2745509567.

The spelling of 128233399 in words is "one hundred twenty-eight million, two hundred thirty-three thousand, three hundred ninety-nine".