1216544 has 24 divisors (see below), whose sum is σ = 2737728. Its totient is φ = 521280.

The previous prime is 1216543. The next prime is 1216547. The reversal of 1216544 is 4456121.

It is not an unprimeable number, because it can be changed into a prime (1216543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2492 + ... + 2939.

It is an arithmetic number, because the mean of its divisors is an integer number (114072).

2^1216544 is an apocalyptic number.

1216544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1216544 is an abundant number, since it is smaller than the sum of its proper divisors (1521184).

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

1216544 is an equidigital number, since it uses as much as digits as its factorization.

1216544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448 (or 5440 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 1216544 is about 1102.9705345112. The cubic root of 1216544 is about 106.7519803577.

The spelling of 1216544 in words is "one million, two hundred sixteen thousand, five hundred forty-four".