1216736 has 24 divisors (see below), whose sum is σ = 2449440. Its totient is φ = 594688.

The previous prime is 1216729. The next prime is 1216751. The reversal of 1216736 is 6376121.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1100 + ... + 1908.

It is an arithmetic number, because the mean of its divisors is an integer number (102060).

2^1216736 is an apocalyptic number.

1216736 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 1216736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1224720).

1216736 is an abundant number, since it is smaller than the sum of its proper divisors (1232704).

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

1216736 is an equidigital number, since it uses as much as digits as its factorization.

1216736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 858 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 1216736 is about 1103.0575687606. The cubic root of 1216736 is about 106.7575960751.

The spelling of 1216736 in words is "one million, two hundred sixteen thousand, seven hundred thirty-six".