1218673216 has 28 divisors (see below), whose sum is σ = 2523451392. Its totient is φ = 582843008.

The previous prime is 1218673213. The next prime is 1218673223. The reversal of 1218673216 is 6123768121.

It is not an unprimeable number, because it can be changed into a prime (1218673213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412480 + ... + 415423.

It is an arithmetic number, because the mean of its divisors is an integer number (90123264).

Almost surely, 2^1218673216 is an apocalyptic number.

1218673216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218673216 is an abundant number, since it is smaller than the sum of its proper divisors (1304778176).

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

1218673216 is an equidigital number, since it uses as much as digits as its factorization.

1218673216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827938 (or 827928 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 1218673216 is about 34909.5003688108. The cubic root of 1218673216 is about 1068.1422376919.

The spelling of 1218673216 in words is "one billion, two hundred eighteen million, six hundred seventy-three thousand, two hundred sixteen".