1281216 has 28 divisors (see below), whose sum is σ = 3390392. Its totient is φ = 427008.

The previous prime is 1281211. The next prime is 1281221. The reversal of 1281216 is 6121821.

It is an interprime number because it is at equal distance from previous prime (1281211) and next prime (1281221).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1281192 and 1281201.

It is not an unprimeable number, because it can be changed into a prime (1281211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3145 + ... + 3528.

2^1281216 is an apocalyptic number.

1281216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1281216 is an abundant number, since it is smaller than the sum of its proper divisors (2109176).

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

1281216 is an equidigital number, since it uses as much as digits as its factorization.

1281216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6688 (or 6678 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

The square root of 1281216 is about 1131.9081234800. The cubic root of 1281216 is about 108.6110764049.

The spelling of 1281216 in words is "one million, two hundred eighty-one thousand, two hundred sixteen".