128340406 has 4 divisors (see below), whose sum is σ = 192510612. Its totient is φ = 64170202.

The previous prime is 128340389. The next prime is 128340413. The reversal of 128340406 is 604043821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604043821 = 139 ⋅4345639.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32085100 + ... + 32085103.

It is an arithmetic number, because the mean of its divisors is an integer number (48127653).

Almost surely, 2^128340406 is an apocalyptic number.

128340406 is a deficient number, since it is larger than the sum of its proper divisors (64170206).

128340406 is an equidigital number, since it uses as much as digits as its factorization.

128340406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64170205.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 128340406 is about 11328.7424721370. The cubic root of 128340406 is about 504.4147793856.

The spelling of 128340406 in words is "one hundred twenty-eight million, three hundred forty thousand, four hundred six".