1218646979 has 8 divisors (see below), whose sum is σ = 1330991040. Its totient is φ = 1106562600.

The previous prime is 1218646963. The next prime is 1218646981. The reversal of 1218646979 is 9796468121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1218646979 - 2⁴ = 1218646963 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 1218646979.

It is not an unprimeable number, because it can be changed into a prime (1218646939) 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, 55037 + ... + 73934.

It is an arithmetic number, because the mean of its divisors is an integer number (166373880).

Almost surely, 2^1218646979 is an apocalyptic number.

1218646979 is a deficient number, since it is larger than the sum of its proper divisors (112344061).

1218646979 is a wasteful number, since it uses less digits than its factorization.

1218646979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129841.

The product of its digits is 1306368, while the sum is 53.

The square root of 1218646979 is about 34909.1245808313. The cubic root of 1218646979 is about 1068.1345722383.

The spelling of 1218646979 in words is "one billion, two hundred eighteen million, six hundred forty-six thousand, nine hundred seventy-nine".