128458393 has 4 divisors (see below), whose sum is σ = 146809600. Its totient is φ = 110107188.

The previous prime is 128458391. The next prime is 128458397. The reversal of 128458393 is 393854821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 393854821 = 71 ⋅5547251.

It is a cyclic number.

It is not a de Polignac number, because 128458393 - 2¹ = 128458391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128458391) 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, 9175593 + ... + 9175606.

It is an arithmetic number, because the mean of its divisors is an integer number (36702400).

Almost surely, 2^128458393 is an apocalyptic number.

It is an amenable number.

128458393 is a deficient number, since it is larger than the sum of its proper divisors (18351207).

128458393 is an equidigital number, since it uses as much as digits as its factorization.

128458393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18351206.

The product of its digits is 207360, while the sum is 43.

The square root of 128458393 is about 11333.9486940783. The cubic root of 128458393 is about 504.5693063450.

The spelling of 128458393 in words is "one hundred twenty-eight million, four hundred fifty-eight thousand, three hundred ninety-three".