489121785 has 24 divisors (see below), whose sum is σ = 858549120. Its totient is φ = 257560992.

The previous prime is 489121783. The next prime is 489121793. The reversal of 489121785 is 587121984.

It is not a de Polignac number, because 489121785 - 2¹ = 489121783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 489121785.

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 in 23 ways as a sum of consecutive naturals, for example, 65239 + ... + 72348.

It is an arithmetic number, because the mean of its divisors is an integer number (35772880).

Almost surely, 2^489121785 is an apocalyptic number.

489121785 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

489121785 is a deficient number, since it is larger than the sum of its proper divisors (369427335).

489121785 is a wasteful number, since it uses less digits than its factorization.

489121785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137677 (or 137674 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 489121785 is about 22116.0978701036. The cubic root of 489121785 is about 787.9022404642.

The spelling of 489121785 in words is "four hundred eighty-nine million, one hundred twenty-one thousand, seven hundred eighty-five".