1218955488 has 144 divisors (see below), whose sum is σ = 3577407120. Its totient is φ = 362115072.

The previous prime is 1218955483. The next prime is 1218955511. The reversal of 1218955488 is 8845598121.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 1218955488.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218955483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 588118 + ... + 590186.

It is an arithmetic number, because the mean of its divisors is an integer number (24843105).

Almost surely, 2^1218955488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218955488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1788703560).

1218955488 is an abundant number, since it is smaller than the sum of its proper divisors (2358451632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218955488 is a wasteful number, since it uses less digits than its factorization.

1218955488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2110 counting only the distinct ones).

The product of its digits is 921600, while the sum is 51.

The square root of 1218955488 is about 34913.5430456435. The cubic root of 1218955488 is about 1068.2246998773.

The spelling of 1218955488 in words is "one billion, two hundred eighteen million, nine hundred fifty-five thousand, four hundred eighty-eight".