1218396864 has 56 divisors (see below), whose sum is σ = 3267872560. Its totient is φ = 400564224.

The previous prime is 1218396827. The next prime is 1218396911. The reversal of 1218396864 is 4686938121.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29449 + ... + 57480.

Almost surely, 2^1218396864 is an apocalyptic number.

It is an amenable number.

1218396864 is an abundant number, since it is smaller than the sum of its proper divisors (2049475696).

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

1218396864 is an equidigital number, since it uses as much as digits as its factorization.

1218396864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87017 (or 87007 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 1218396864 is about 34905.5420241543. The cubic root of 1218396864 is about 1068.0614926229.

The spelling of 1218396864 in words is "one billion, two hundred eighteen million, three hundred ninety-six thousand, eight hundred sixty-four".