489478139 has 2 divisors, whose sum is σ = 489478140. Its totient is φ = 489478138.

The previous prime is 489478117. The next prime is 489478151. The reversal of 489478139 is 931874984.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 489478139 - 2⁸ = 489477883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (489475139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244739069 + 244739070.

It is an arithmetic number, because the mean of its divisors is an integer number (244739070).

Almost surely, 2^489478139 is an apocalyptic number.

489478139 is a deficient number, since it is larger than the sum of its proper divisors (1).

489478139 is an equidigital number, since it uses as much as digits as its factorization.

489478139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 489478139 is about 22124.1528425384. The cubic root of 489478139 is about 788.0935383950.

The spelling of 489478139 in words is "four hundred eighty-nine million, four hundred seventy-eight thousand, one hundred thirty-nine".