489991642 has 16 divisors (see below), whose sum is σ = 867082752. Its totient is φ = 203222160.

The previous prime is 489991633. The next prime is 489991657. The reversal of 489991642 is 246199984.

It is a self number, because there is not a number n which added to its sum of digits gives 489991642.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 564073 + ... + 564940.

It is an arithmetic number, because the mean of its divisors is an integer number (54192672).

Almost surely, 2^489991642 is an apocalyptic number.

489991642 is a deficient number, since it is larger than the sum of its proper divisors (377091110).

489991642 is a wasteful number, since it uses less digits than its factorization.

489991642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129053.

The product of its digits is 1119744, while the sum is 52.

The square root of 489991642 is about 22135.7548323973. The cubic root of 489991642 is about 788.3690338185.

The spelling of 489991642 in words is "four hundred eighty-nine million, nine hundred ninety-one thousand, six hundred forty-two".