1218393 has 24 divisors (see below), whose sum is σ = 1986816. Its totient is φ = 712800.

The previous prime is 1218391. The next prime is 1218401. The reversal of 1218393 is 3938121.

It is not a de Polignac number, because 1218393 - 2¹ = 1218391 is a prime.

It is a super-3 number, since 3×1218393³ = 5426045613640033371, which contains 333 as substring.

It is a Curzon number.

1218393 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1218391) 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 23 ways as a sum of consecutive naturals, for example, 2871 + ... + 3267.

It is an arithmetic number, because the mean of its divisors is an integer number (82784).

2^1218393 is an apocalyptic number.

It is an amenable number.

1218393 is a deficient number, since it is larger than the sum of its proper divisors (768423).

1218393 is a wasteful number, since it uses less digits than its factorization.

1218393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 442 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1218393 is about 1103.8084072881. The cubic root of 1218393 is about 106.8060363545.

The spelling of 1218393 in words is "one million, two hundred eighteen thousand, three hundred ninety-three".