1218438265 has 8 divisors (see below), whose sum is σ = 1595046528. Its totient is φ = 886136880.

The previous prime is 1218438209. The next prime is 1218438281. The reversal of 1218438265 is 5628348121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1218438265 - 2¹¹ = 1218436217 is a prime.

It is a Duffinian number.

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, 11076657 + ... + 11076766.

It is an arithmetic number, because the mean of its divisors is an integer number (199380816).

Almost surely, 2^1218438265 is an apocalyptic number.

It is an amenable number.

1218438265 is a deficient number, since it is larger than the sum of its proper divisors (376608263).

1218438265 is a wasteful number, since it uses less digits than its factorization.

1218438265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22153439.

The product of its digits is 92160, while the sum is 40.

The square root of 1218438265 is about 34906.1350624786. The cubic root of 1218438265 is about 1068.0735900257.

The spelling of 1218438265 in words is "one billion, two hundred eighteen million, four hundred thirty-eight thousand, two hundred sixty-five".