1216616 has 8 divisors (see below), whose sum is σ = 2281170. Its totient is φ = 608304.

The previous prime is 1216603. The next prime is 1216619. The reversal of 1216616 is 6166121.

It can be written as a sum of positive squares in only one way, i.e., 1094116 + 122500 = 1046^2 + 350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1216591 and 1216600.

It is not an unprimeable number, because it can be changed into a prime (1216619) 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, 76031 + ... + 76046.

2^1216616 is an apocalyptic number.

It is an amenable number.

1216616 is a deficient number, since it is larger than the sum of its proper divisors (1064554).

1216616 is a wasteful number, since it uses less digits than its factorization.

1216616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152083 (or 152079 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 1216616 is about 1103.0031731595. The cubic root of 1216616 is about 106.7540863210.

The spelling of 1216616 in words is "one million, two hundred sixteen thousand, six hundred sixteen".