1218423 has 8 divisors (see below), whose sum is σ = 1629936. Its totient is φ = 809600.

The previous prime is 1218421. The next prime is 1218433. The reversal of 1218423 is 3248121.

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 1218423 - 2¹ = 1218421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (203742).

2^1218423 is an apocalyptic number.

1218423 is a deficient number, since it is larger than the sum of its proper divisors (411513).

1218423 is an equidigital number, since it uses as much as digits as its factorization.

1218423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345.

The product of its digits is 384, while the sum is 21.

The square root of 1218423 is about 1103.8219965194. The cubic root of 1218423 is about 106.8069129613.

The spelling of 1218423 in words is "one million, two hundred eighteen thousand, four hundred twenty-three".