128458438 has 4 divisors (see below), whose sum is σ = 192687660. Its totient is φ = 64229218.

The previous prime is 128458433. The next prime is 128458439. The reversal of 128458438 is 834854821.

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: 834854821 = 1759 ⋅474619.

It is a super-3 number, since 3×128458438³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128458394 and 128458403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128458433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32114608 + ... + 32114611.

It is an arithmetic number, because the mean of its divisors is an integer number (48171915).

Almost surely, 2^128458438 is an apocalyptic number.

128458438 is a deficient number, since it is larger than the sum of its proper divisors (64229222).

128458438 is an equidigital number, since it uses as much as digits as its factorization.

128458438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64229221.

The product of its digits is 245760, while the sum is 43.

The square root of 128458438 is about 11333.9506792645. The cubic root of 128458438 is about 504.5693652632.

The spelling of 128458438 in words is "one hundred twenty-eight million, four hundred fifty-eight thousand, four hundred thirty-eight".