1289216 has 22 divisors (see below), whose sum is σ = 2579220. Its totient is φ = 644096.

The previous prime is 1289213. The next prime is 1289231. The reversal of 1289216 is 6129821.

It is not an unprimeable number, because it can be changed into a prime (1289213) 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 as a sum of consecutive naturals, namely, 395 + ... + 1653.

2^1289216 is an apocalyptic number.

1289216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1289610).

1289216 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1289216 is an equidigital number, since it uses as much as digits as its factorization.

1289216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279 (or 1261 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 1289216 is about 1135.4364799495. The cubic root of 1289216 is about 108.8366658428.

The spelling of 1289216 in words is "one million, two hundred eighty-nine thousand, two hundred sixteen".