1218804279 has 24 divisors (see below), whose sum is σ = 2026946688. Its totient is φ = 632869440.

The previous prime is 1218804263. The next prime is 1218804281. The reversal of 1218804279 is 9724088121.

It is not a de Polignac number, because 1218804279 - 2⁴ = 1218804263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218804279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218804289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 529459 + ... + 531755.

It is an arithmetic number, because the mean of its divisors is an integer number (84456112).

Almost surely, 2^1218804279 is an apocalyptic number.

1218804279 is a deficient number, since it is larger than the sum of its proper divisors (808142409).

1218804279 is an frugal number, since it uses more digits than its factorization.

1218804279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615 (or 2318 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1218804279 is about 34911.3775007518. The cubic root of 1218804279 is about 1068.1805276688.

It can be divided in two parts, 12188042 and 79, that added together give a palindrome (12188121).

The spelling of 1218804279 in words is "one billion, two hundred eighteen million, eight hundred four thousand, two hundred seventy-nine".