128452397 has 8 divisors (see below), whose sum is σ = 135062040. Its totient is φ = 121988160.

The previous prime is 128452367. The next prime is 128452403. The reversal of 128452397 is 793254821.

It can be written as a sum of positive squares in 4 ways, for example, as 8462281 + 119990116 = 2909^2 + 10954^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128452397 - 2²⁰ = 127403821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128452307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34538 + ... + 38075.

It is an arithmetic number, because the mean of its divisors is an integer number (16882755).

Almost surely, 2^128452397 is an apocalyptic number.

It is an amenable number.

128452397 is a deficient number, since it is larger than the sum of its proper divisors (6609643).

128452397 is an equidigital number, since it uses as much as digits as its factorization.

128452397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72703.

The product of its digits is 120960, while the sum is 41.

The square root of 128452397 is about 11333.6841759421. The cubic root of 128452397 is about 504.5614556976.

The spelling of 128452397 in words is "one hundred twenty-eight million, four hundred fifty-two thousand, three hundred ninety-seven".