128439379 has 4 divisors (see below), whose sum is σ = 128651584. Its totient is φ = 128227176.

The previous prime is 128439359. The next prime is 128439397. The reversal of 128439379 is 973934821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128439379 - 2⁷ = 128439251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128439319) 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, 105192 + ... + 106405.

It is an arithmetic number, because the mean of its divisors is an integer number (32162896).

Almost surely, 2^128439379 is an apocalyptic number.

128439379 is a deficient number, since it is larger than the sum of its proper divisors (212205).

128439379 is an equidigital number, since it uses as much as digits as its factorization.

128439379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212204.

The product of its digits is 326592, while the sum is 46.

The square root of 128439379 is about 11333.1098556398. The cubic root of 128439379 is about 504.5444102056.

It can be divided in two parts, 12843 and 9379, that added together give a palindrome (22222).

The spelling of 128439379 in words is "one hundred twenty-eight million, four hundred thirty-nine thousand, three hundred seventy-nine".