1218742320 has 80 divisors (see below), whose sum is σ = 3783373920. Its totient is φ = 324544512.

The previous prime is 1218742319. The next prime is 1218742391. The reversal of 1218742320 is 232478121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191022 + ... + 197298.

It is an arithmetic number, because the mean of its divisors is an integer number (47292174).

Almost surely, 2^1218742320 is an apocalyptic number.

1218742320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218742320 is an abundant number, since it is smaller than the sum of its proper divisors (2564631600).

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

1218742320 is a wasteful number, since it uses less digits than its factorization.

1218742320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7102 (or 7096 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 1218742320 is about 34910.4901140044. The cubic root of 1218742320 is about 1068.1624267262.

The spelling of 1218742320 in words is "one billion, two hundred eighteen million, seven hundred forty-two thousand, three hundred twenty".