1216688 has 40 divisors (see below), whose sum is σ = 2666496. Its totient is φ = 532800.

The previous prime is 1216681. The next prime is 1216693. The reversal of 1216688 is 8866121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5345 + ... + 5567.

2^1216688 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 1216688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333248).

1216688 is an abundant number, since it is smaller than the sum of its proper divisors (1449808).

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

1216688 is a wasteful number, since it uses less digits than its factorization.

1216688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 267 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 1216688 is about 1103.0358108421. The cubic root of 1216688 is about 106.7561922011.

The spelling of 1216688 in words is "one million, two hundred sixteen thousand, six hundred eighty-eight".