128538407 has 8 divisors (see below), whose sum is σ = 134178912. Its totient is φ = 123012000.

The previous prime is 128538391. The next prime is 128538427. The reversal of 128538407 is 704835821.

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 128538407 - 2⁴ = 128538391 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 (128538427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26219 + ... + 30732.

It is an arithmetic number, because the mean of its divisors is an integer number (16772364).

Almost surely, 2^128538407 is an apocalyptic number.

128538407 is a deficient number, since it is larger than the sum of its proper divisors (5640505).

128538407 is an equidigital number, since it uses as much as digits as its factorization.

128538407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57049.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 128538407 is about 11337.4779823380. The cubic root of 128538407 is about 504.6740464299.

The spelling of 128538407 in words is "one hundred twenty-eight million, five hundred thirty-eight thousand, four hundred seven".