1218165 has 16 divisors (see below), whose sum is σ = 2099328. Its totient is φ = 599616.

The previous prime is 1218157. The next prime is 1218167. The reversal of 1218165 is 5618121.

It is not a de Polignac number, because 1218165 - 2³ = 1218157 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2929 + ... + 3318.

It is an arithmetic number, because the mean of its divisors is an integer number (131208).

2^1218165 is an apocalyptic number.

1218165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1218165 is a deficient number, since it is larger than the sum of its proper divisors (881163).

1218165 is a wasteful number, since it uses less digits than its factorization.

1218165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6268.

The product of its digits is 480, while the sum is 24.

The square root of 1218165 is about 1103.7051236630. The cubic root of 1218165 is about 106.7993736725.

It can be divided in two parts, 12181 and 65, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 1218165 in words is "one million, two hundred eighteen thousand, one hundred sixty-five".