128232407 has 4 divisors (see below), whose sum is σ = 131214600. Its totient is φ = 125250216.

The previous prime is 128232397. The next prime is 128232409. The reversal of 128232407 is 704232821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704232821 = 167 ⋅4216963.

It is a cyclic number.

It is not a de Polignac number, because 128232407 - 2¹² = 128228311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128232407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128232409) 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, 1491032 + ... + 1491117.

It is an arithmetic number, because the mean of its divisors is an integer number (32803650).

Almost surely, 2^128232407 is an apocalyptic number.

128232407 is a deficient number, since it is larger than the sum of its proper divisors (2982193).

128232407 is an equidigital number, since it uses as much as digits as its factorization.

128232407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982192.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 128232407 is about 11323.9748763409. The cubic root of 128232407 is about 504.2732506151.

The spelling of 128232407 in words is "one hundred twenty-eight million, two hundred thirty-two thousand, four hundred seven".