1218239 has 4 divisors (see below), whose sum is σ = 1329000. Its totient is φ = 1107480.

The previous prime is 1218221. The next prime is 1218247. The reversal of 1218239 is 9328121.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1218239 is a prime.

It is a super-2 number, since 2×1218239² = 2968212522242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218209) 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 3 ways as a sum of consecutive naturals, for example, 55364 + ... + 55385.

It is an arithmetic number, because the mean of its divisors is an integer number (332250).

2^1218239 is an apocalyptic number.

1218239 is a deficient number, since it is larger than the sum of its proper divisors (110761).

1218239 is a wasteful number, since it uses less digits than its factorization.

1218239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110760.

The product of its digits is 864, while the sum is 26.

The square root of 1218239 is about 1103.7386466007. The cubic root of 1218239 is about 106.8015362130.

It can be divided in two parts, 12182 and 39, that added together give a palindrome (12221).

The spelling of 1218239 in words is "one million, two hundred eighteen thousand, two hundred thirty-nine".