1216646 has 16 divisors (see below), whose sum is σ = 1946160. Its totient is φ = 568800.

The previous prime is 1216619. The next prime is 1216681. The reversal of 1216646 is 6466121.

It is a happy number.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 3680 + ... + 3996.

It is an arithmetic number, because the mean of its divisors is an integer number (121635).

2^1216646 is an apocalyptic number.

1216646 is a deficient number, since it is larger than the sum of its proper divisors (729514).

1216646 is a wasteful number, since it uses less digits than its factorization.

1216646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439.

The product of its digits is 1728, while the sum is 26.

The square root of 1216646 is about 1103.0167723113. The cubic root of 1216646 is about 106.7549637811.

The spelling of 1216646 in words is "one million, two hundred sixteen thousand, six hundred forty-six".