1218640489 has 12 divisors (see below), whose sum is σ = 1340342080. Its totient is φ = 1107156600.

The previous prime is 1218640481. The next prime is 1218640513. The reversal of 1218640489 is 9840468121.

It is not a de Polignac number, because 1218640489 - 2³ = 1218640481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218640481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 370924 + ... + 374194.

Almost surely, 2^1218640489 is an apocalyptic number.

It is an amenable number.

1218640489 is a deficient number, since it is larger than the sum of its proper divisors (121701591).

1218640489 is a wasteful number, since it uses less digits than its factorization.

1218640489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6372 (or 6361 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1218640489 is about 34909.0316250680. The cubic root of 1218640489 is about 1068.1326760901.

The spelling of 1218640489 in words is "one billion, two hundred eighteen million, six hundred forty thousand, four hundred eighty-nine".