1216894488 has 64 divisors (see below), whose sum is σ = 3207375360. Its totient is φ = 383978496.

The previous prime is 1216894487. The next prime is 1216894513. The reversal of 1216894488 is 8844986121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216894488.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216894487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42181 + ... + 64907.

It is an arithmetic number, because the mean of its divisors is an integer number (50115240).

Almost surely, 2^1216894488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216894488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1603687680).

1216894488 is an abundant number, since it is smaller than the sum of its proper divisors (1990480872).

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

1216894488 is a wasteful number, since it uses less digits than its factorization.

1216894488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22856 (or 22852 counting only the distinct ones).

The product of its digits is 884736, while the sum is 51.

The square root of 1216894488 is about 34884.0147918785. The cubic root of 1216894488 is about 1067.6223117078.

The spelling of 1216894488 in words is "one billion, two hundred sixteen million, eight hundred ninety-four thousand, four hundred eighty-eight".