1218418807 has 4 divisors (see below), whose sum is σ = 1225714896. Its totient is φ = 1211122720.

The previous prime is 1218418793. The next prime is 1218418841. The reversal of 1218418807 is 7088148121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7088148121 = 1097 ⋅6461393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218418807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218418807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218818807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3647794 + ... + 3648127.

It is an arithmetic number, because the mean of its divisors is an integer number (306428724).

Almost surely, 2^1218418807 is an apocalyptic number.

1218418807 is a deficient number, since it is larger than the sum of its proper divisors (7296089).

1218418807 is an equidigital number, since it uses as much as digits as its factorization.

1218418807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296088.

The product of its (nonzero) digits is 28672, while the sum is 40.

The square root of 1218418807 is about 34905.8563424535. The cubic root of 1218418807 is about 1068.0679044178.

The spelling of 1218418807 in words is "one billion, two hundred eighteen million, four hundred eighteen thousand, eight hundred seven".