128000401 has 4 divisors (see below), whose sum is σ = 131122404. Its totient is φ = 124878400.

The previous prime is 128000399. The next prime is 128000413. The reversal of 128000401 is 104000821.

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: 104000821 = 37 ⋅2810833.

It can be written as a sum of positive squares in 2 ways, for example, as 36300625 + 91699776 = 6025^2 + 9576^2 .

It is a cyclic number.

It is not a de Polignac number, because 128000401 - 2¹ = 128000399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128000491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1560940 + ... + 1561021.

It is an arithmetic number, because the mean of its divisors is an integer number (32780601).

Almost surely, 2^128000401 is an apocalyptic number.

It is an amenable number.

128000401 is a deficient number, since it is larger than the sum of its proper divisors (3122003).

128000401 is an equidigital number, since it uses as much as digits as its factorization.

128000401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122002.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 128000401 is about 11313.7262208346. The cubic root of 128000401 is about 503.9689462369.

The spelling of 128000401 in words is "one hundred twenty-eight million, four hundred one", and thus it is an aban number.