489939985 has 32 divisors (see below), whose sum is σ = 636387840. Its totient is φ = 360928512.

The previous prime is 489939971. The next prime is 489940001. The reversal of 489939985 is 589939984.

It is a cyclic number.

It is not a de Polignac number, because 489939985 - 2¹⁵ = 489907217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 879327 + ... + 879883.

It is an arithmetic number, because the mean of its divisors is an integer number (19887120).

Almost surely, 2^489939985 is an apocalyptic number.

It is an amenable number.

489939985 is a deficient number, since it is larger than the sum of its proper divisors (146447855).

489939985 is a wasteful number, since it uses less digits than its factorization.

489939985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825.

The product of its digits is 25194240, while the sum is 64.

The square root of 489939985 is about 22134.5879789979. The cubic root of 489939985 is about 788.3413284409.

Subtracting 489939985 from its reverse (589939984), we obtain a palindrome (99999999).

The spelling of 489939985 in words is "four hundred eighty-nine million, nine hundred thirty-nine thousand, nine hundred eighty-five".