1218145 has 16 divisors (see below), whose sum is σ = 1566720. Its totient is φ = 907200.

The previous prime is 1218131. The next prime is 1218157. The reversal of 1218145 is 5418121.

It is not a de Polignac number, because 1218145 - 2⁷ = 1218017 is a prime.

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

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, 4360 + ... + 4630.

It is an arithmetic number, because the mean of its divisors is an integer number (97920).

2^1218145 is an apocalyptic number.

It is an amenable number.

1218145 is a deficient number, since it is larger than the sum of its proper divisors (348575).

1218145 is a wasteful number, since it uses less digits than its factorization.

1218145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its digits is 320, while the sum is 22.

The square root of 1218145 is about 1103.6960632348. The cubic root of 1218145 is about 106.7987891870.

The spelling of 1218145 in words is "one million, two hundred eighteen thousand, one hundred forty-five".