128407 has 4 divisors (see below), whose sum is σ = 130240. Its totient is φ = 126576.

The previous prime is 128399. The next prime is 128411. The reversal of 128407 is 704821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704821 = 13 ⋅54217.

It is a cyclic number.

It is not a de Polignac number, because 128407 - 2³ = 128399 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 (128437) 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, 807 + ... + 952.

It is an arithmetic number, because the mean of its divisors is an integer number (32560).

2¹²⁸⁴⁰⁷ is an apocalyptic number.

128407 is a deficient number, since it is larger than the sum of its proper divisors (1833).

128407 is an equidigital number, since it uses as much as digits as its factorization.

128407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 128407 is about 358.3392247578. The cubic root of 128407 is about 50.4502008837.

It can be divided in two parts, 128 and 407, that added together give a palindrome (535).

The spelling of 128407 in words is "one hundred twenty-eight thousand, four hundred seven".