128998423 has 4 divisors (see below), whose sum is σ = 132144768. Its totient is φ = 125852080.

The previous prime is 128998381. The next prime is 128998447. The reversal of 128998423 is 324899821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324899821 = 9743 ⋅33347.

It is a cyclic number.

It is not a de Polignac number, because 128998423 - 2²⁵ = 95443991 is a prime.

It is a super-3 number, since 3×128998423³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128998453) 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, 1573111 + ... + 1573192.

It is an arithmetic number, because the mean of its divisors is an integer number (33036192).

Almost surely, 2^128998423 is an apocalyptic number.

128998423 is a deficient number, since it is larger than the sum of its proper divisors (3146345).

128998423 is an equidigital number, since it uses as much as digits as its factorization.

128998423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146344.

The product of its digits is 248832, while the sum is 46.

The square root of 128998423 is about 11357.7472678344. The cubic root of 128998423 is about 505.2753757396.

The spelling of 128998423 in words is "one hundred twenty-eight million, nine hundred ninety-eight thousand, four hundred twenty-three".