1218831960 has 128 divisors (see below), whose sum is σ = 3812290560. Its totient is φ = 311385600.

The previous prime is 1218831959. The next prime is 1218831973. The reversal of 1218831960 is 691388121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 381570 + ... + 384750.

It is an arithmetic number, because the mean of its divisors is an integer number (29783520).

Almost surely, 2^1218831960 is an apocalyptic number.

1218831960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218831960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906145280).

1218831960 is an abundant number, since it is smaller than the sum of its proper divisors (2593458600).

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

1218831960 is a wasteful number, since it uses less digits than its factorization.

1218831960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329 (or 3325 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1218831960 is about 34911.7739451893. The cubic root of 1218831960 is about 1068.1886143052.

The spelling of 1218831960 in words is "one billion, two hundred eighteen million, eight hundred thirty-one thousand, nine hundred sixty".