1216145 has 8 divisors (see below), whose sum is σ = 1667904. Its totient is φ = 833904.

The previous prime is 1216123. The next prime is 1216147. The reversal of 1216145 is 5416121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216145 - 2¹⁰ = 1215121 is a prime.

It is a super-2 number, since 2×1216145² = 2958017322050, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1216147) 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, 17339 + ... + 17408.

It is an arithmetic number, because the mean of its divisors is an integer number (208488).

2^1216145 is an apocalyptic number.

It is an amenable number.

1216145 is a deficient number, since it is larger than the sum of its proper divisors (451759).

1216145 is an equidigital number, since it uses as much as digits as its factorization.

1216145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34759.

The product of its digits is 240, while the sum is 20.

The square root of 1216145 is about 1102.7896444925. The cubic root of 1216145 is about 106.7403083048.

The spelling of 1216145 in words is "one million, two hundred sixteen thousand, one hundred forty-five".