1216065 has 8 divisors (see below), whose sum is σ = 1945728. Its totient is φ = 648560.

The previous prime is 1216043. The next prime is 1216067. The reversal of 1216065 is 5606121.

It is a happy number.

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

It is not a de Polignac number, because 1216065 - 2⁹ = 1215553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216067) 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, 40521 + ... + 40550.

It is an arithmetic number, because the mean of its divisors is an integer number (243216).

2^1216065 is an apocalyptic number.

1216065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216065 is a deficient number, since it is larger than the sum of its proper divisors (729663).

1216065 is an equidigital number, since it uses as much as digits as its factorization.

1216065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81079.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1216065 is about 1102.7533722460. The cubic root of 1216065 is about 106.7379677363.

The spelling of 1216065 in words is "one million, two hundred sixteen thousand, sixty-five".