1218369 has 4 divisors (see below), whose sum is σ = 1624496. Its totient is φ = 812244.

The previous prime is 1218367. The next prime is 1218383. The reversal of 1218369 is 9638121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1218369 - 2¹ = 1218367 is a prime.

It is a super-2 number, since 2×1218369² = 2968846040322, which contains 22 as substring.

It is a D-number.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1218367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203059 + ... + 203064.

It is an arithmetic number, because the mean of its divisors is an integer number (406124).

2^1218369 is an apocalyptic number.

It is an amenable number.

1218369 is a deficient number, since it is larger than the sum of its proper divisors (406127).

1218369 is an equidigital number, since it uses as much as digits as its factorization.

1218369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406126.

The product of its digits is 2592, while the sum is 30.

The square root of 1218369 is about 1103.7975357827. The cubic root of 1218369 is about 106.8053350587.

It can be divided in two parts, 12 and 18369, that added together give a palindrome (18381).

The spelling of 1218369 in words is "one million, two hundred eighteen thousand, three hundred sixty-nine".