1216365 has 16 divisors (see below), whose sum is σ = 1971648. Its totient is φ = 640256.

The previous prime is 1216351. The next prime is 1216373. The reversal of 1216365 is 5636121.

It is a cyclic number.

It is not a de Polignac number, because 1216365 - 2⁴ = 1216349 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 757 + ... + 1733.

It is an arithmetic number, because the mean of its divisors is an integer number (123228).

2^1216365 is an apocalyptic number.

1216365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216365 is a deficient number, since it is larger than the sum of its proper divisors (755283).

1216365 is an equidigital number, since it uses as much as digits as its factorization.

1216365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its digits is 1080, while the sum is 24.

The square root of 1216365 is about 1102.8893870194. The cubic root of 1216365 is about 106.7467443389.

The spelling of 1216365 in words is "one million, two hundred sixteen thousand, three hundred sixty-five".