489887989 has 2 divisors, whose sum is σ = 489887990. Its totient is φ = 489887988.

The previous prime is 489887953. The next prime is 489888041. The reversal of 489887989 is 989788984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318015889 + 171872100 = 17833^2 + 13110^2 .

It is a cyclic number.

It is not a de Polignac number, because 489887989 - 2¹⁹ = 489363701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489887939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244943994 + 244943995.

It is an arithmetic number, because the mean of its divisors is an integer number (244943995).

Almost surely, 2^489887989 is an apocalyptic number.

It is an amenable number.

489887989 is a deficient number, since it is larger than the sum of its proper divisors (1).

489887989 is an equidigital number, since it uses as much as digits as its factorization.

489887989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83607552, while the sum is 70.

The square root of 489887989 is about 22133.4134059797. The cubic root of 489887989 is about 788.3134392795.

The spelling of 489887989 in words is "four hundred eighty-nine million, eight hundred eighty-seven thousand, nine hundred eighty-nine".