1216705 has 8 divisors (see below), whose sum is σ = 1668672. Its totient is φ = 834288.

The previous prime is 1216693. The next prime is 1216711. The reversal of 1216705 is 5076121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216705 - 2⁷ = 1216577 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian 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, 17347 + ... + 17416.

It is an arithmetic number, because the mean of its divisors is an integer number (208584).

2^1216705 is an apocalyptic number.

It is an amenable number.

1216705 is a deficient number, since it is larger than the sum of its proper divisors (451967).

1216705 is an equidigital number, since it uses as much as digits as its factorization.

1216705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34775.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1216705 is about 1103.0435168206. The cubic root of 1216705 is about 106.7566894107.

The spelling of 1216705 in words is "one million, two hundred sixteen thousand, seven hundred five".