489121786 has 4 divisors (see below), whose sum is σ = 733682682. Its totient is φ = 244560892.

The previous prime is 489121783. The next prime is 489121793. The reversal of 489121786 is 687121984.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 277855561 + 211266225 = 16669^2 + 14535^2 .

It is not an unprimeable number, because it can be changed into a prime (489121781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122280445 + ... + 122280448.

Almost surely, 2^489121786 is an apocalyptic number.

489121786 is a deficient number, since it is larger than the sum of its proper divisors (244560896).

489121786 is a wasteful number, since it uses less digits than its factorization.

489121786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244560895.

The product of its digits is 193536, while the sum is 46.

The square root of 489121786 is about 22116.0978927115. The cubic root of 489121786 is about 787.9022410011.

The spelling of 489121786 in words is "four hundred eighty-nine million, one hundred twenty-one thousand, seven hundred eighty-six".