1216424 has 32 divisors (see below), whose sum is σ = 2600640. Its totient is φ = 528000.

The previous prime is 1216421. The next prime is 1216433. The reversal of 1216424 is 4246121.

1216424 is nontrivially palindromic in base 3.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1216396 and 1216405.

It is not an unprimeable number, because it can be changed into a prime (1216421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1724 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (81270).

2^1216424 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 1216424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300320).

1216424 is an abundant number, since it is smaller than the sum of its proper divisors (1384216).

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

1216424 is a wasteful number, since it uses less digits than its factorization.

1216424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 637 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 1216424 is about 1102.9161346177. The cubic root of 1216424 is about 106.7484702342.

The spelling of 1216424 in words is "one million, two hundred sixteen thousand, four hundred twenty-four".