489657218 has 6 divisors (see below), whose sum is σ = 734532771. Its totient is φ = 244812962.

The previous prime is 489657197. The next prime is 489657229. The reversal of 489657218 is 812756984.

It can be written as a sum of positive squares in only one way, i.e., 244828609 + 244828609 = 15647^2 + 15647^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=15647.

It is a super-2 number, since 2×489657218² = 479528382278999048, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 23471 + ... + 39117.

Almost surely, 2^489657218 is an apocalyptic number.

489657218 is a deficient number, since it is larger than the sum of its proper divisors (244875553).

489657218 is an frugal number, since it uses more digits than its factorization.

489657218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31296 (or 15649 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 489657218 is about 22128.1996104518. The cubic root of 489657218 is about 788.1896365206.

Multiplying 489657218 by its sum of digits (50), we get a square (24482860900 = 156470²).

The spelling of 489657218 in words is "four hundred eighty-nine million, six hundred fifty-seven thousand, two hundred eighteen".