128458394 has 4 divisors (see below), whose sum is σ = 192687594. Its totient is φ = 64229196.

The previous prime is 128458391. The next prime is 128458397. The reversal of 128458394 is 493854821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128458391) and next prime (128458397).

It can be written as a sum of positive squares in only one way, i.e., 110523169 + 17935225 = 10513^2 + 4235^2 .

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 as a sum of consecutive naturals, namely, 32114597 + ... + 32114600.

Almost surely, 2^128458394 is an apocalyptic number.

128458394 is a deficient number, since it is larger than the sum of its proper divisors (64229200).

128458394 is an equidigital number, since it uses as much as digits as its factorization.

128458394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64229199.

The product of its digits is 276480, while the sum is 44.

The square root of 128458394 is about 11333.9487381936. The cubic root of 128458394 is about 504.5693076543.

The spelling of 128458394 in words is "one hundred twenty-eight million, four hundred fifty-eight thousand, three hundred ninety-four".