489646139 has 4 divisors (see below), whose sum is σ = 490283640. Its totient is φ = 489008640.

The previous prime is 489646127. The next prime is 489646177. The reversal of 489646139 is 931646984.

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 489646139 - 2²⁰ = 488597563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (489645139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317597 + ... + 319134.

It is an arithmetic number, because the mean of its divisors is an integer number (122570910).

Almost surely, 2^489646139 is an apocalyptic number.

489646139 is a deficient number, since it is larger than the sum of its proper divisors (637501).

489646139 is an equidigital number, since it uses as much as digits as its factorization.

489646139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637500.

The product of its digits is 1119744, while the sum is 50.

The square root of 489646139 is about 22127.9492723569. The cubic root of 489646139 is about 788.1836919411.

The spelling of 489646139 in words is "four hundred eighty-nine million, six hundred forty-six thousand, one hundred thirty-nine".