128340479 has 2 divisors, whose sum is σ = 128340480. Its totient is φ = 128340478.

The previous prime is 128340469. The next prime is 128340521. The reversal of 128340479 is 974043821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128340479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128340419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64170239 + 64170240.

It is an arithmetic number, because the mean of its divisors is an integer number (64170240).

Almost surely, 2^128340479 is an apocalyptic number.

128340479 is a deficient number, since it is larger than the sum of its proper divisors (1).

128340479 is an equidigital number, since it uses as much as digits as its factorization.

128340479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 128340479 is about 11328.7456940299. The cubic root of 128340479 is about 504.4148750226.

The spelling of 128340479 in words is "one hundred twenty-eight million, three hundred forty thousand, four hundred seventy-nine".