128498439 has 4 divisors (see below), whose sum is σ = 171331256. Its totient is φ = 85665624.

The previous prime is 128498431. The next prime is 128498443. The reversal of 128498439 is 934894821.

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

It is not a de Polignac number, because 128498439 - 2³ = 128498431 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 (128498431) 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, 21416404 + ... + 21416409.

It is an arithmetic number, because the mean of its divisors is an integer number (42832814).

Almost surely, 2^128498439 is an apocalyptic number.

128498439 is a deficient number, since it is larger than the sum of its proper divisors (42832817).

128498439 is an equidigital number, since it uses as much as digits as its factorization.

128498439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42832816.

The product of its digits is 497664, while the sum is 48.

The square root of 128498439 is about 11335.7151957872. The cubic root of 128498439 is about 504.6217328743.

The spelling of 128498439 in words is "one hundred twenty-eight million, four hundred ninety-eight thousand, four hundred thirty-nine".