128372423 has 4 divisors (see below), whose sum is σ = 135923760. Its totient is φ = 120821088.

The previous prime is 128372411. The next prime is 128372459. The reversal of 128372423 is 324273821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324273821 = 47 ⋅6899443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128372423 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 128372423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128372483) 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, 3775643 + ... + 3775676.

It is an arithmetic number, because the mean of its divisors is an integer number (33980940).

Almost surely, 2^128372423 is an apocalyptic number.

128372423 is a deficient number, since it is larger than the sum of its proper divisors (7551337).

128372423 is an equidigital number, since it uses as much as digits as its factorization.

128372423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7551336.

The product of its digits is 16128, while the sum is 32.

The square root of 128372423 is about 11330.1554711310. The cubic root of 128372423 is about 504.4567212435.

The spelling of 128372423 in words is "one hundred twenty-eight million, three hundred seventy-two thousand, four hundred twenty-three".