1218916894 has 36 divisors (see below), whose sum is σ = 2029288464. Its totient is φ = 548619552.

The previous prime is 1218916889. The next prime is 1218916927. The reversal of 1218916894 is 4986198121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4400284 + ... + 4400560.

It is an arithmetic number, because the mean of its divisors is an integer number (56369124).

Almost surely, 2^1218916894 is an apocalyptic number.

1218916894 is a deficient number, since it is larger than the sum of its proper divisors (810371570).

1218916894 is an equidigital number, since it uses as much as digits as its factorization.

1218916894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 339 counting only the distinct ones).

The product of its digits is 248832, while the sum is 49.

The square root of 1218916894 is about 34912.9903331124. The cubic root of 1218916894 is about 1068.2134258810.

The spelling of 1218916894 in words is "one billion, two hundred eighteen million, nine hundred sixteen thousand, eight hundred ninety-four".